In my own experience, 911 drivers, in general, look down their collective noses at ANY 356 (steel or plastic) because they're not considered to be real Porsches (they have those, um, Volkswagen parts in them, after all - especially the Pre-A cars).
I never call before-hand to ask if events allow replicas to join the Porsche Corral - I just show up and have never been turned away from some pretty high profile events. The event management couldn't tell a replica from a real one, anyway, and the only people who have ever complained have been 911 owners! (WTF?)
Hell! Pearl won the 2009 Spectator Award in the European class of the car club jamboree at Hilton Head Island Concours ( second on the east coast to Amelia Island).
Hoss Hallstrand and I both had our cars included in the whole "Porsche Experience" at the Watkins Glen Historic races a few years back, too - no one ever asked whether they were replicas - and there were only 100 cars "invited".
And the capper was when I went to the "Porsche Fest" at Boston's Museum of Transportation, years back, with the local 356 club and got a flared-fendered replica (OH! The Horrors!!) on the cover of the PCA's New England News Letter! (Wait! --- Porsche never made a flared-fendered Speedster, did they?)
Just show up - it's always easier to apologize later......