man, i have no idea what it would take to get the good captain and the shaggs out of retirement for a show. i'm afraid it will never happen. now, the bevis frond is doable...i've talked to nick saloman many times and he knows he has a dc show next time he tours, which might be for terrastock 2008.
however, to satiate your psychedelic appetite, i do have eugene chadbourne & jimmy carl black (of the original mothers of invention), tony conrad (who played with john cale in the dream syndicate in the mid-'60s, pre-velvet underground), damo suzuki (can's vocalist from 1970-1973), and the amazing japanese bands suishou no fune (with bardo pond side project alasehir) and up-tight coming up in the next few months.
sweetcell, if you want a bong hit, your attendance at one of these shows in mandatory.