Informal social organization can be found on the social signup page, here. There you can sign up for dinners, pub outings, concerts, and suggest other events.

Tuesday night there will be a cocktail Reception (drinks, starters) at MacArthur Park 5pm-8pm

This is right next to the Palo Alto train station - at the end of Palm Drive (on campus) and the start of University Drive in Palo Alto, so easy walking for those of you staying in hotels in downtown Palo Alto.