CEDAR RAPIDS — Two little girls — Ava, 6, and Sophia Olivarez, 4, — danced to a steel drum rendition of “Under the Sea” on Fifth Street SE. Sous chef Elliott Brown manned a tent outside Cobble Hill slinging craft beers and tacos al pastor on Second Street SE. Mbololwa Mundia, 21, pulled a block from a giant Jenga puzzle, toppling the tower in Greene Square.And Eric Schulz, 44, sipped a Millstream Octoberfest while chatting with friends on Second Avenue SE.“It’s a lot more fun this year,” Schulz said.