Chino Hills,
CA?
If so, the Chosen game club plays down the 57 in Brea.
http://therealmgames.info/ Primarily on Thursday nights for Fantasy/
40k, but there's also Magic/Warmachine/Flames of War groups that meet on other days.
Adventurer's Guild and GMI are the Riverside game stores, both with good play groups. There's also a Montclair/Ontario Games Workshop store. Pegasus Hobbies is also in Montclair for stuff, but not sure if they have an active gaming club there.