Music Tonight: If you're hitting the bars and clubs this weekend, there's an extremely high probability that you'll run into Halloween hijinks. If you're a Bluegrass fan, the best place to get your groovy-ghoulies on and kick off the elongated weekend Halloween celebration is Covington's Madison Theatre. After a summer of hitting the fest circuit hard, Bluegrass legend Del McCoury, inventive guitarist/composer/improviser Keller Williams and The Travelin' McCourys (Del's sons' band) are presenting the two-day "fest on wheels" dubbed Delloween (the second night of Delloween takes place Saturday in Roanoke, Va.). The show promises lots of special tricks and treats, including two costume contests. The best overall costume winner wins $250, while the best Del McCoury costume will net you a pair of tickets to McCoury's annual outdoor festival, DelFest. The show is also featuring a food drive — bring non-perishable food items if you go (also, half of the money from sales of Delloween posters will be donated to the Children's Hunger Alliance). Del plays first, so if you'd like to see a living legend perform, get their by the 8 p.m. start time. Williams plays second, performing a rare "no loops" set, then The McCourys (with Williams) will do a "late-night" jam to close the festivities. Tickets for the all-ages show are $20.