Scheduling and open enrollment for group classes

Hello there. I apologize if this has been answered previously. I tried searching the forum but couldn't find anything helpful.

Using Squarespace's scheduler, I am offering weekly recurring group classes. I would love to allow clients to enroll in the group classes after the initial start date, without having to manually delete classes that have already taken place. I am aware there is there is the option to sign up for classes individually, but it would be a hassle for clients to sign up every single time. 

Appreciate any help. Thank you!