Frozen Head is a great park. Roche and I organized a family hang there a couple of summers ago at Judge Branch. Easy 0.6 mi in.
I haven't been to all the campsites, but I have reconned several. Tub Springs and Judge Branch are good for hanging and have water. Mart Fields was widowmaker central as of last spring. Spicewood branch (has water) and North Old Mac (dry) are smallish for a group hang. Water availability is pretty good overall, but creeks can dry up in the summer.
The wildflowers are absolutely spectacular during April and May, making it popular in the spring. The park has several campsites, but in the big scheme they really aren't far from one another. A two night trip would involve a lot of lolly gagging or some creative routes for those wanting to cover more miles.
The weekend of May 18th is the Trail Days Festival in Damascus, VA. A good many HFs go to that (including me). The Hot Springs hang is usually in early May, but I haven't seen a thread on it yet (if there is one this spring). Early May would work better for me for a Frozen Head hang.