Breaking Dawn filming schedule!

And according to Gossip Cop the actors will be arriving on set in October

Gossip Cop spoke with a source close to the production, “The actors arrive on set in October for rehearsal, hair and make-up tests, etc.” Shooting begins in November, and “this has always been the plan.”
“There may be some confusion because actors have said in interviews that they start in October,” explains our insider. “Prep for the actors starts in October, [but] production has always been scheduled for November.”