You don't need to rego, just show up and BYO. But if you want to let everyone know you're going, by all means do so. ;-)
Meet @ Kilauea Military Camp (KMC) Flagpole at 2PM Saturday. Trail start TBD by Hares. No-frills weekend, BYO everything based at KMC. Military/DoD can sponsor non-affiliated hashers, find one. Sunday morning hangover trail at KMC.