My DH's boss (before he retired) has an open house for Christmas which we were "requested" to attend. Pretentious comes to mind when describing it. She has a carol sing-along as part of the activities so I always joked to my DH that we were going so I could sing for his job. Now we just go because we like the company.
My friend does Christmas in a big way and has an entire room in the basement for storing decorations off-season. When she decorates, even the plants have angels in them!