diff --git a/apiserver/apiserver/api/serializers.py b/apiserver/apiserver/api/serializers.py
index 8d9de8e..b2bdb46 100644
--- a/apiserver/apiserver/api/serializers.py
+++ b/apiserver/apiserver/api/serializers.py
@@ -202,23 +202,6 @@ class CardSerializer(serializers.ModelSerializer):
 
 
 
-class UserTrainingSerializer(serializers.ModelSerializer):
-    class Meta:
-        model = models.Training
-        exclude = ['user']
-        depth = 2
-
-class UserSerializer(serializers.ModelSerializer):
-    training = UserTrainingSerializer(many=True)
-    member = MemberSerializer()
-
-    class Meta:
-        model = User
-        fields = ['id', 'username', 'member', 'transactions', 'cards', 'training', 'is_staff']
-        depth = 1
-
-
-
 class TransactionSerializer(serializers.ModelSerializer):
     class Meta:
         model = models.Transaction
@@ -229,10 +212,18 @@ class TransactionSerializer(serializers.ModelSerializer):
 class TrainingSerializer(serializers.ModelSerializer):
     attendance_status = serializers.ChoiceField(['waiting for payment', 'withdrawn', 'rescheduled', 'no-show', 'attended', 'confirmed'])
     session = serializers.PrimaryKeyRelatedField(queryset=models.Session.objects.all())
+    student_name = serializers.SerializerMethodField()
     class Meta:
         model = models.Training
         fields = '__all__'
         read_only_fields = ['user', 'sign_up_date', 'paid_date', 'member_id']
+    def get_student_name(self, obj):
+        if obj.user:
+            member = obj.user.member
+        else:
+            member = models.Member.objects.get(id=obj.member_id)
+        return member.preferred_name + ' ' + member.last_name
+
 
 class StudentTrainingSerializer(TrainingSerializer):
     attendance_status = serializers.ChoiceField(['waiting for payment', 'withdrawn'])
@@ -281,6 +272,24 @@ class CourseDetailSerializer(serializers.ModelSerializer):
 
 
 
+class UserTrainingSerializer(serializers.ModelSerializer):
+    session = SessionListSerializer()
+    class Meta:
+        model = models.Training
+        exclude = ['user']
+        depth = 2
+
+class UserSerializer(serializers.ModelSerializer):
+    training = UserTrainingSerializer(many=True)
+    member = MemberSerializer()
+
+    class Meta:
+        model = User
+        fields = ['id', 'username', 'member', 'transactions', 'cards', 'training', 'is_staff']
+        depth = 1
+
+
+
 class RegistrationSerializer(RegisterSerializer):
     first_name = serializers.CharField(max_length=32)
     last_name = serializers.CharField(max_length=32)
diff --git a/webclient/src/App.js b/webclient/src/App.js
index 4894f01..e5c6231 100644
--- a/webclient/src/App.js
+++ b/webclient/src/App.js
@@ -154,7 +154,7 @@ function App() {
 						</Route>
 
 						<Route path='/classes/:id'>
-							<ClassDetail token={token} user={user} />
+							<ClassDetail token={token} user={user} setUserCache={setUserCache} />
 						</Route>
 						<Route path='/classes'>
 							<Classes token={token} />
diff --git a/webclient/src/Classes.js b/webclient/src/Classes.js
index 8a600b6..1bae213 100644
--- a/webclient/src/Classes.js
+++ b/webclient/src/Classes.js
@@ -1,11 +1,11 @@
 import React, { useState, useEffect } from 'react';
 import { BrowserRouter as Router, Switch, Route, Link, useParams } from 'react-router-dom';
 import './light.css';
-import { Container, Divider, Dropdown, Form, Grid, Header, Icon, Image, Menu, Message, Segment, Table } from 'semantic-ui-react';
+import { Button, Container, Divider, Dropdown, Form, Grid, Header, Icon, Image, Menu, Message, Segment, Table } from 'semantic-ui-react';
 import moment from 'moment';
-import { isInstructor, BasicTable, requester } from './utils.js';
+import { isAdmin, isInstructor, BasicTable, requester } from './utils.js';
 import { NotFound, PleaseLogin } from './Misc.js';
-import { InstructorClassDetail } from './InstructorClasses.js';
+import { InstructorClassDetail, InstructorClassAttendance } from './InstructorClasses.js';
 
 function ClassTable(props) {
 	const { classes } = props;
@@ -66,8 +66,7 @@ export function Classes(props) {
 	return (
 		<Container>
 			<Header size='large'>Class List</Header>
-
-			<Header size='medium'>Upcoming</Header>
+<Header size='medium'>Upcoming</Header>
 			{classes ?
 				<ClassTable classes={classes.filter(x => x.datetime > now)} />
 			:
@@ -87,8 +86,9 @@ export function Classes(props) {
 export function ClassDetail(props) {
 	const [clazz, setClass] = useState(false);
 	const [error, setError] = useState(false);
-	const { token, user } = props;
+	const { token, user, setUserCache } = props;
 	const { id } = useParams();
+	const userTraining = user.training.find(x => x.session.id == id);
 
 	useEffect(() => {
 		requester('/sessions/'+id+'/', 'GET', token)
@@ -101,6 +101,42 @@ export function ClassDetail(props) {
 		});
 	}, []);
 
+	const handleSignup = () => {
+		const data = { attendance_status: 'waiting for payment', session: id };
+		requester('/training/', 'POST', token, data)
+		.then(res => {
+			// bad code:
+			const newClass = { ...clazz, student_count: clazz.student_count+1 };
+			setUserCache({ ...user, training: [...user.training, {...res, session: newClass }] });
+			setClass(newClass);
+		})
+		.catch(err => {
+			console.log(err);
+			setError(true);
+		});
+	};
+
+	const handleToggle = (newStatus) => {
+		const data = { attendance_status: newStatus, session: id };
+		requester('/training/'+userTraining.id+'/', 'PUT', token, data)
+		.then(res => {
+			// bad code:
+			const studentChange = newStatus === 'withdrawn' ? -1 : 1
+			const newClass = { ...clazz, student_count: clazz.student_count + studentChange };
+			const trainingIndex = user.training.indexOf(userTraining);
+			const newTraining = user.training;
+			newTraining[trainingIndex] = {...res, session: newClass };
+			setUserCache({ ...user, training: newTraining });
+			setClass(newClass);
+		})
+		.catch(err => {
+			console.log(err);
+			setError(true);
+		});
+	};
+
+	// TODO: calculate yesterday and lock signups
+
 	return (
 		<Container>
 			{!error ?
@@ -150,6 +186,37 @@ export function ClassDetail(props) {
 						</BasicTable>
 
 						<Header size='medium'>Attendance</Header>
+
+						{(isAdmin(user) || clazz.instructor === user.id) &&
+							<Segment padded>
+								<InstructorClassAttendance clazz={clazz} {...props} />
+							</Segment>
+						}
+
+						{clazz.instructor != user.id &&
+							(userTraining ?
+								<div>
+									<p>Status: {userTraining.attendance_status}</p>
+									{userTraining.attendance_status === 'withdrawn' ?
+										<Button onClick={() => handleToggle('waiting for payment')}>
+											Sign back up
+										</Button>
+									:
+										<Button onClick={() => handleToggle('withdrawn')}>
+											Withdraw from Class
+										</Button>
+									}
+								</div>
+							:
+								((clazz.max_students && clazz.student_count >= clazz.max_students) ?
+									<p>The course is full.</p>
+								:
+									<Button onClick={handleSignup}>
+										Sign me up!
+									</Button>
+								)
+							)
+						}
 					</div>
 				:
 					<p>Loading...</p>
diff --git a/webclient/src/InstructorClasses.js b/webclient/src/InstructorClasses.js
index 36b1ff1..2701a89 100644
--- a/webclient/src/InstructorClasses.js
+++ b/webclient/src/InstructorClasses.js
@@ -7,6 +7,83 @@ import './light.css';
 import { Button, Container, Checkbox, Divider, Dropdown, Form, Grid, Header, Icon, Image, Label, Menu, Message, Segment, Table } from 'semantic-ui-react';
 import { BasicTable, staticUrl, requester } from './utils.js';
 
+function AttendanceRow(props) {
+	const { student, token } = props;
+	const [training, setTraining] = useState(student);
+	const [error, setError] = useState(false);
+
+	const handleMark = (newStatus) => {
+		const data = { attendance_status: newStatus };
+		requester('/training/'+training.id+'/', 'PATCH', token, data)
+		.then(res => {
+			setTraining(res);
+			setError(false);
+		})
+		.catch(err => {
+			console.log(err);
+			setError(true);
+		});
+	};
+
+	// 'withdrawn', 'rescheduled', 'no-show', 'attended', 'confirmed'
+
+	const makeProps = (name) => ({
+		onClick: () => handleMark(name),
+		toggle: true,
+		active: training.attendance_status === name,
+	});
+
+	return (
+		<div>
+			<p>{training.student_name}:</p>
+
+			<Button {...makeProps('withdrawn')}>
+				Withdrawn
+			</Button>
+
+			<Button {...makeProps('confirmed')}>
+				Confirmed
+			</Button>
+
+			<Button {...makeProps('rescheduled')}>
+				Rescheduled
+			</Button>
+
+			<Button {...makeProps('no-show')}>
+				No-show
+			</Button>
+
+			<Button {...makeProps('attended')}>
+				Attended
+			</Button>
+
+			{error && <p>Error: something went wrong!</p>}
+
+		</div>
+	);
+}
+
+export function InstructorClassAttendance(props) {
+	const { clazz, token } = props;
+	const [error, setError] = useState(false);
+
+	return (
+		<div>
+			<Header size='medium'>Instructor Panel</Header>
+
+			<Header size='small'>Mark Attendance</Header>
+
+			{clazz.students.length ?
+				clazz.students.map((x, i) =>
+					<p><AttendanceRow key={i} student={x} {...props} /></p>
+				)
+			:
+				<p>No students yet.</p>
+			}
+		</div>
+	);
+};
+
 function InstructorClassEditor(props) {
 	const { input, setInput, error, editing } = props;
 
diff --git a/webclient/src/Training.js b/webclient/src/Training.js
index 452cfc0..b16d7b9 100644
--- a/webclient/src/Training.js
+++ b/webclient/src/Training.js
@@ -27,14 +27,12 @@ export function Training(props) {
 					<Table.Body>
 						{user.training.map((x, i) =>
 							<Table.Row key={i}>
-								<Table.Cell>
-									<Link to={'/courses/'+x.session.course.id}>{x.session.course.name}</Link>
-								</Table.Cell>
+								<Table.Cell>{x.session.course_name}</Table.Cell>
 								<Table.Cell>
 									<Link to={'/classes/'+x.session.id}>{moment(x.session.datetime).format('MMMM Do YYYY')}</Link>
 								</Table.Cell>
 								<Table.Cell>{x.attendance_status}</Table.Cell>
-								<Table.Cell>{x.session.old_instructor}</Table.Cell>
+								<Table.Cell>{x.session.instructor_name}</Table.Cell>
 							</Table.Row>
 						)}
 					</Table.Body>