Volleyball Open Gyms?

Looking for some relatively high level co-ed or men's indoor (6-man) volleyball open gyms. I'm 34m and played D3 in college - haven't played consistently in quite a while but I was invited to play in a tournament in Denver in April so would like to get some reps in before that.

Really looking for anything that's not beginner level, it doesn't need to be the highest level of competition. I've looked around online and asked around at rec centers but really haven't been able to find anything.

Anyone know of something similar to what I'm describing? Thanks for the help!