City officials are urging football fans who plan to catch Saturday’s San Antonio Brahmas game at the Alamodome to make preparations for Fiesta-based traffic and parking issues. The Dome’s Lot C will be closed to host Fiesta Carnival, and parking at Lot B will be open on first-come, first-served basis, according to the city. What’s more, additional Fiesta events in and around downtown are likely to snarl traffic.