Sheridan Mayor Joe Fabiano beamed with pride as his town of nearly 6,000 residents became one of the world’s space capitals for a few hours Monday. “This is one of the biggest events I’ve ever seen here,” Fabiano said, as he and about 600 schoolchildren, parents and government officials packed into Sheridan’s Chapman School gymnasium to hear NASA Administrator Sean O’Keefe and astronaut David Wolf talk about space exploration.