Producer Jeffrey Richards has been shaking up Broadway’s opening night conventions this fall. His production of “Who’s Afraid of Virginia Woolf?” opened on a Saturday night, rather than the more common Thursday or Sunday that would land reviews in a prime daily edition. His production of “Glengarry Glen Ross,” initially set to open Nov. 11, still hasn’t opened due to a delay the producer attributed to superstorm Sandy.The latest opening of a Richards production, David Mamet’s “The Anarchist,” set an unusual curtain time of 4 p.m. Sunday. Given the running time of just 70 minutes, at least the early curtain meant everyone was home at a reasonable hour. That was less true for the press who turned out for the opening party at Redeye Grill. Writer-director Mamet never talks to the media, so his beret-clad brush-off wasn’t a surprise. But when, about an hour after the show ended, cast member Debra Winger turned up, she unexpectedly bowed out of press duties too. It took co-star Patti LuPone at least 75 minutes to make it to the party — a reminder that while she’s always good for a bon mot, she’ll still make you wait for it.