The traditional carnival gets a buggy twist this weekend at the Butterfly Pavilion's Insectival. Booths of cotton candy, face painting, and ring tosses are interspersed with nature walks, ladybug releases, and cockroach races (pictured here). The courageous should check out the insect-eating contest (chocolate-covered mill worms, sour and cream crickets)--and the more subdued can head to the shady gazebo for stories about spiders and other bugs. Sat-Sun, July 11-12: 10 a.m.-4 p.m. Butterfly Pavilion, 6252 W. 104th Ave., Westminster, 303-469-5441 Free with paid admission. More like it: Colorado Railroad Museum anniversary, Sat-Sun, Jul 11-12 | Children's Museum's Playhouse Exhibition opens, Wed, Jul 15