Any idea where accepted teams, schedules, all that good stuff is posted?

Try:
http://www.columbiaunitedfc.com/hstournaments/irmojvtourn/index_E.html

Is there an Irmo JV post-season tourney?

TRY:
http://www.columbiaunitedfc.com/hstournaments/irmopostjv/index_E.html

Anyone know when schedules are going to be posted?

The schedule is posted.