I say this to everyone, but…
SJC, SFO, OAK, or DEL
SJC is San Jose and is a convenient airport to fly to or fly out of and has a number of international destinations including Mexico, Canada, and China
SFO is San Francisco and is a huge airport with 4 runways, a United Maintenance facility as United has a hub there, and Alaska Airlines which made it a focus city for them.
OAK is Oakland and is also a relatively large airport. Southwest has a large presence at OAK as well as Spirit and Allegiant. The airport has 3 runways although they may be used for different purposes than just Commercial airliners.
DEL is Delhi and is a great airport to fly to. It has 3 runways as well and has destinations to all over the world. The airport is almost always foggy and that can be hard for an event but it is a great airport otherwise, with Air India having a hub there and other low-cost carriers focus on the city like IndiGo and SpiceJet