Booking Multiple Clients in one session time

Is it possible to allow multiple clients to book the same session time? For example, if I am hosting a class and want to allow 15 people to sign up for that class is there a way to do that in sessions or to limit the number of people who can sign up on on the same time? Is the best way to do this sessions or should I be using the lead form? Ideally, I would like to have multiple session options per month and allow clients to sign up for more than one if they want. Thanks!!