Treffen at The American Club registration opens Wednesday, August 4, 2021, at 3:00 PM EST. Information on tours and activities coming soon! Treffen – “to meet”. That is the entire concept behind the PCA Treffens: an opportunity for PCA members to meet their fellow Porsche enthusiasts in some of the most spectacular locations in North America. PCA’s Treffens provide the opportunity to drive some of the best roads in North America.