the glass buttes knap in is near Burns, OR, east of bend. it is an unusual event in that there are no set start or end dates, no one "in charge" , no fee, no schedule, no website...
etc...
but the dates traditionally coincide with spring break for oregon universities, which are march 21-25 this year, so most people will go between march 18-27.
I have been going for about 12 years and encourage (almost) anyone to go.
some things to keep in mind:
1. it's out on a dirt road in the high desert with no facilities except port-a-potties (we all chip in for the potties)- bring everything including water.
2. temps are typically 45 daytime and 25 night (plus or minus 20).
3. site is not dog-friendly due to lots of piles of debitage and unattended campsites.
go east on 20 out of bend, then hang a right at mp77 and follow the main dirt road a few miles.
look me up if you go- i'm in the tent with the mammoth!
aaron