We just held our yearly trials event for the R&T club here in Maryland. It was also an AHRMA points event. Our guy that did the insurance and paperwork stuff said that this was probably the last time there would be a AMA/AHRMA event as we had AMA, D7 and AHRMA points.
There are plenty of vintage events to ride in. Most modern events now have vintage classes so if you just want to ride in events to have fun and meet others who enjoy the sport, who cares who sanctions it!