Hey just introducing myself. I like to play with big groups and once i finish some maps will start testing. I have some maps on halo reach if anyone is interested.
Welcome Reecer, definitely check out some of the customs run on Fridays, usually those are the most popular.
I believe that there are some reach lobbies run, but worst comes to worst you can just host one, I'm sure that there will be some people wanting to play it and test/play some maps too.