I asked the program coordinator for specifics when I interviewed.
They had about 800 applicants to the UCSD anesthesia program this year. They usually interview about 90 candidates. So...obviously they are pretty stingy about invitations. They sent out their first wave of invitations about mid-October and they have been waiting to send out more invitations...but I believe more may be coming out at some point because they only offered interview dates in Oct/mid-Nov for the first wave of invitations and I believe they will interview until January. So good luck!