Is this an open call, or are these people you have selected for audition?
I ask because as a professional actor, if I went to an open call audition I would expect to wait, be seen and leave. I would not be expecting, (as true indie and Director have said,) some type of group acting class.
If this was an audition I was selected to attend, I would either have the sides in advance and have worked on them and prepped myself to go in and audition, or I would expect to be given the sides when I got there and then I would be expecting that I could read them over, analyze them, work out the beats, get in the mindset etc. Group activities are fun, and I know you are coming from a place of wanting to make it less stressful, but in my case at least, I would find it more stressful.
Also, I may have suggested this to you in another thread, but I highly suggest running auditions for film this way:
1. Put out a good detailed call notice asking people to submit headshots and resumes.
2. Look through the headshot and resume submissions to see who interests you. Look at reels if they have them.
3. With a narrowed down list, reach out to them and give them the sides. Ask them to video themselves doing the sides with somebody and send it to you. Give them a deadline when they have to have it in to you by.
4. From those submissions, you can narrow it down to those you want to have an in person audition with.
I'm an actor, I have gone though this process a lot. I have also cast two features and bunch of shorts this way.
It will save you lots of time.