I've just relocated here from NC where I was active with our local PCA DE/AutoX crew. I expect to be similarly involved up here. Hit me up via PM if there are any other kindred souls lurking around here!
Your new club is Potomac https://pcapotomac.org/ They are VERY active and very large. They do everything, Rallies, Concours, autocrosses, DCs, everything a club can do. You are also fortunate in that you are relatively close (within reason) to PCA National Headquarters where they have annual open houses with hundreds of cars on display, not to mention around 7 dealerships within reasonable driving distance.