Yes, first learned about synchronous fireflies a few years back, when camping in the Smokies. We have not tried entering the lottery to see them there.
I recently learned about their 2012 discovery in western PA. I have been reading everything I can find about them, which isn't much and doesn't give much detail. There is an annual festival, with guided tours to a site, but it is on private property. Most of this year's festival events have been canceled due to the virus situation and the limited number of tours to that viewing site are sold out.
I did find a short article by one of the people who first discovered them in Pa, in which he said that on return trips to the region he found them at multiple locations throughout the Allegheny National Forest area, as well as up into the Allegany State Park area in NY. He gave no detailed information on locations, but said to look for damp, shady, mixed hardwood forest areas in hollows near streams, and best viewing should be around midnight to 1 a.m.
Since it does not seem likely that I will get any detailed tips on sites, our plan is to scout potential areas in the daytime, then pick a couple to try at night. Maybe we'll get lucky.