as for location, sunset park is well known and is easy to get to. it has everything there too: picnic areas, an open field for games, a play ground to conquer, etc. I didn't set a date yet, but if anything, i'll go with saya's suggestion and make it friday.
Anime Expo (July 4-7)
Juliet Starling- Lollipop Chainsaw
Harry Potter (maybe)