S_Matt said:

It is a pity that this sort of thing simply wouln't work with Star Wars in this day and age - there's going to be no similar forcing Lucas's hand due to undergound screenings as these are extremely rare, mainly because copyright holders have vastly greater powers to confiscate personal property (i.e. privately owned 35mm prints) and to prosecute offenders.

There was that free screening of a Technicolor print that was publicized in advance, and was even covered by local media last year in Boston. The stormtroopers didn't show up to seize the print.

If Lucasfilm crashed such a party, it might generate some negative press and questions they really don't want asked outside fanboy circles.