Hello Stefani,
Thanks for contacting us!
1) With our WooTickets plugin, you will be able to sell tickets to your events or classes.
2) I don’t believe users will be able to cancel their own attendance. They would have to contact the admin.
3) We are not yet able to group tickets together.
If you have a moment, we’d love for you to submit your idea to our UserVoice forum. We take user ideas and contributions very seriously, and many times their ideas end up in our future releases.
– Casey Driscoll