That is a very personal question. Just go when you feel like competing.
OTB play is a lot different than playing online. If you don't mind losing, then just play. Otherwise, try to find out the ratings of the most common players in the events you might go to. If there are rating sections, that would make it easier.
Also, it depends on which chess.com rating you mean and what time control(s) you would be looking at playing OTB. My chess.com blitz is abot 400 points lower than my OTB rating (I suck at blitz -- mostly time problems). My Live Standard is within 100 points (but not with very many games).
I was wondering what you guys think would be an apporpiate chess.com rating before i go to a tournement. I would rather not go to a touneyment and get stomped. i was wondering what rating should i achieve on chess.com befor ei go to an acually real life tounrment.1200,1400,1500? etc