Unfortunately, you chose an improper city for Psytrance...it's quite rare that we have Psy parties here, from what I've seen (I really want more!). But the next big Psy event I know about is Gaian Mind at Wicker Man (
http://www.wickermanburning.org/). I think Shpongle/Hallucinogen is supposed to be playing with the Disco Biscuits on 4/12.
As far as this weekend, there's a few different parties...I'm tryin to go to God's Basement on friday and wherever dance out loud is gonna be on saturday
There's also Playloop @ Fluid and something going on at Monkeybar Lounge