You also have Drift Nirvana at Summit Point, but it might be a bit far. I've been going for about 7 years in different cars. This year, I have just been sticking to the skid pad (due to new rules/regs) to learn the driving style of the mustang (other than local roads late at night). The 100 drifters/200 drifters of December at Summit Point is awesome with people that come from everywhere.
Club Loose events are one of the best on the East coast, for sure. As I get older, the road trips suck more and more, so I tend to stick to the 2 hour driving range.