The following link is a good place to try to keep up with Hayden Rettig. Fox Sports West Prepzone
They cover the Mission League well and even broadcast some of their games live on Friday nights.
They show four SoCal games live at 9:00 p.m. Central time on on this site.
The schedule for August & September is out: 2012 Fox Sports West Prepzone Schedule
Catholic (Los Angeles) isn't scheduled for Aug. or Sept. but some of their league games are in there if you want to watch the level of competition.
Games involving Mission League teams that are scheduled:
all games are 9 p.m. Central (You can catch the second half when you get home from your favorite team's game)
9/7 Valencia @ Chaminade
9/7 Crenshaw (Los Angeles) @ Westlake
9/14 Oaks Christian @ Chaminade
9/14 St. Francis @ La Mirada
9/21 Narbonne (Los Angeles) @ Serra
9/28 Chaminade @ Notre Dame
9/28 St. Bonaventure @ Westlake
With this many ML games slated, surely they'll have one or two Catholic games in Oct. & Dec.
LSU is actively recruiting kids from other teams on the Aug. & Sept. schedule including Oaks Christian (2014 OT Reno Rosene, 2014 Athlete Darick Holmes, 2014 CB Malick Cyphers) on 9/07/12 & 9'14/12.