is there any rating limitation to play as a fan?
Schedule

yes
rapid rating should be below 2200
I haven't played any rapid games on chess.com so how do they know my rapid rating and also can't people lose rating on purpose to play?

if you are unrated you can probably play, but there might be a requirement of x games. Yes people can sandbag to play but i don't think it will be that severe since most people are already sub-2200

I read the article. If you log on to live chess on saturdays (June 1st, 8th, and 15th) you can play (times TBD)
here is the schedule for the summer season. Hope you can play
We are in group A