I missed the Sydney, Australia, gala premiere of TMP because I wasn't yet a fan. I understand every actor entrance got huge applause. The ST II premiere replicated this, and there was much communal relief in the
Kobayashi Maru scene, when Spock is not dead, and audible sobbing at the actual death.
I instigated a little audience participation with ST III. My club was invited to two previews and the premiere night. The film debut was delayed almost six months, and I'd read the novelization and "Starlog" collectible magazine's synopsis already. I took in four (empty) wine glasses and we clinked them together in the "absent friends" toast scene for the first preview. I took eight glasses for the second preview, and a friend smuggled in a box of at least 12 champagne flutes for our row at the premiere. We got great applause! We also deliberately went wild for Grace Lee Whitney's cameo and Nimoy's voiceover - as "Frank Force" - in
Excelsior's elevator.
I actually helped to organise a huge gala preview for ST IV that had Sydney "A List" celebrities, the first annual "Buspak" advertising awards, a disco after-party
and free alcohol. The awards night section was
terrible but the ST film was enjoyed by many people who'd never seen a ST episode.
At premiere night of "First Contact", the cameos by the EMH, Ogawa and Barclay got great reactions.

Buspak invitation by
Ian McLean, on Flickr
Above: The first annual Buspak Awards, coinciding with a gala preview night for "Star Trek IV: The Voyage Home", State Theatre, Sydney. Notice they got the name of the film wrong!
1800 Sydney A-listers (and 200 paid-ticket-holders Trek fans) were at the 2009 premiere at the Sydney Opera House and gave the movie a standing ovation.