Last year, my first IOE trip covered Christmas eve and Christmas day. My LCA was pretty senior, kids out of the house and brought his wife along for a 30 SFO hour layover (Christmas Day). His kids were scattered around the U.S. so they had already done their Christmas. He couldn't believe that the planners put a IOE on that trip. But when they're backed up on training I would expect they'll do the same this year. I didn't get to bid for that month so I didn't have any "off" days. Hopefully they will honor your schedule, but from what I understand, it comes down to LCA availability.