I'd have to see a map of where conference attendees stay. I assumed some would be commuting every day just like residents. I also could be wrong but I thought a lot would stay in hotels near the airport, especially those who live out of town but work for companies that have offices in South Bay and are going to visit the offices while they're in the Bay Area.

One option for commuting conferencegoers is to take transit into the conference to beat the traffic and take Uber or Lyft back after having dinner near the conference, when there is less traffic. Except some would take it on the way back as well because the traffic got them to familiarize themselves with public transit.