San Diego Bayfair on Mission Bay is Southern Californias largest annual beach festival and powerboat competition - "The World Series of Powerboat Racing". Taking place September 12-14, 2025, Bayfair features H1 Hydroplanes, Grand Prix, Limited classes, Hydro Games, live music, corn hole competition, low-rider regional car show. RV camping, food and merchandise vendors, interactive displays, Beer gardens. A great event for the entire family.