Comedy is so often presented in dim, cramped, smoky bars that changing the venue to a barn can only be a welcome relief. But don’t expect hayseed humor at tonight’s “Ninth Annual Evening of Comedy,” as two of the performers are former schoolteachers, one has a degree from Harvard, and another an MBA from MIT. In other words, despite the barnyard allusions, this should be fairly brainy stuff. The smart-mouthed smarties include T. Marni Vos, Glen Steer, and “Election Town Crier,” Bob Somerby. At 9:30 p.m. at the Barns of Wolf Trap, 1624 Trap Rd., Vienna. $15. (703) 938-2404.CP