Runners or walkers who want to participate in the final 2011 run sponsored by the Atlanta BeltLine  should sign up by Wednesday if they want the cheapest rate of $30 to register.  After Wednesday, the fee for the 10K run/walk through neighborhoods on the Eastside Trail jumps to $35. It will be $40 on Dec. 3, the date of the event. The event starts and ends at Park Tavern on 10th Street.  Organizers are encouraging all Atlanta based alumni association to compete for cash in its "Tailgate Challenge,"  Got to  www.beltline.org to register.