The YPP sessions generally begin in the Physics 1AL labs in Mayer Hall on UCSD's campus. Specifically, we meet in Mayer Hall room 2306 or 2110, on the 2nd floor of Mayer Hall nearer to York Hall. This is on the south side of Mayer Hall close to and level with Revelle Plaza.
Parking is available in the lot near the intersection of Scholars Dr S and Revelle College Dr. Most of these spots are free on weekends, but look out for spots with signs saying "'A' permit required 24/7", as you will get ticketed for parking in them.
A map of the meeting location is shown below, where students should be by 10 AM. It is also where students should be picked up when YPP has ended, at 12:30-1:00 PM:
View YPP Meeting Location in a larger map