We have been doing pretty much a 5v5 mix everyday if not at least every other day. We schedule 2 mixes a week at least using the new discord server:
Join up, any active players who are down to mix are more then welcome to join that server strictly for bf2 mixes.
I have scheduled two mixes this week Wednesday & Thursday 18:00 GMT, I also purchased a new server for us to mix on that hopefully will average the ping out fairly well. Looking for a couple more players so message up before people jump on and let me know they can play.
Aside from this scheduling method, the discord server is pretty solid to get mixes going on the spot whenever player activity is good.