Add, change or remove participants

Open the event
Navigate to ‘Who?’
Click ‘options’
Choose ‘edit participants’

Here you can do the following:

Add new participants;
Delete participants by pressing the gear icon and choose 'delete';
Change participants by pressing the gear icon and choose 'edit', making the changes and press the check mark icon;
Share the event with a link.

Press ‘Update’ to save changes.

Note: Only newly added participants (or participants where the email address has changed) will receive an e-mail (so do not remove participants unless you really want to).