Multiple booking per hour

The Events Calendar does not offer any booking functionality. However the premium add-on which ties it into Eventbrite does. It sounds like you might be able to setup an event in Eventbrite with 12 tickets. The tickets can be free or payed. Then from your calendar each person interesting in attending can grab a ticket. If you have further questions about that addon, checkout the presales forum over there. Much faster and more detailed responses than the volunteer community here, which is an excellent community but hey we’re volunteering so don’t expect fast responses. Premium Support Forums.

Cheers!

– Brook