We're looking at the same thing down in Torrance. Now, there is already the Fall Classic, but that has started to have this annoying tendency to fill up. There's a lot of interest down our way.
What you need for an offseason is a venue (at least the size of Grand Terrace's gym; for most high schools it's a 2-gym setup), a field, and something like 20-40 volunteers to run the field and snack stand and pits. As far as scheduling, you want to try to avoid any other weekend where an event is happening.
I suggest reading the following whitepaper--there's a newer version on the FIRST website, but last time I looked the paper appeared to be down.
http://www.chiefdelphi.com/media/papers/2076
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Past teams:
2003-2007: FRC0330 BeachBots
2008: FRC1135 Shmoebotics
2012: FRC4046 Schroedinger's Dragons
"Rockets are tricky..."--Elon Musk
