Scheduling Limits for Online Events

Hi Folks,
I am looking into switching all of my scheduling over to squarespace, one on one sessions and events.
I am wondering if it is possible to set my client booking limits to remain open for scheduling throughout the duration of my event.
How do I do this?
I know I need to set my classes to group one and have them be the only thing in group one so I can create a different set of limits for classes as opposed to sessions.
Do I set it to 0 days in advance? set it to close based on number of attendees? and then go in after the event and close it out myself?
Thanks in advance for your help.

I got my answer via email from customer support.

For anyone else wondering about this, if you set your Client Scheduling Limit to Do Not Allow Clients to Schedule Fewer Than to be "0 hours in advance, registration will stay open until the start of the event, at which time it closes.

I have suggested that for those of us offering online events, it would be nice to have the option to keep registration open until the event ends. 

I often have at least a couple of people jump onto my events halfway through via the event scheduler I am currently using (which I am abandoning for other reasons at this time).