Keep your flash mobs, I prefer the idea of the Cash Mob. That's an event where folks get out and support local businesses by opening their wallets. Occupy Riverwest is going to "cash mob" (if that's a verb) two indie booksellers - People's Books Co-op, 2122 E. Locust St., and Woodland Pattern Book Center, 720 E. Locust St. - today from 5:30 to 7 p.m.