I have many holiday triggers, fruit cake, red wine, smoked country ham and milk chocolate,  all of which I love. The only steps I can take to avoid the Migraines is to avoid eating them. Another holiday trigger are strong odors from some air freshners and the usual holiday stress.

Even apart from specific food triggers, I think for many people just the change in stress or intensity level is a holiday trigger, whether coming off intense work period and/or entering into stressful family dynamics. For many it also simply the biochemical changes that come from over eating generally - and over drinking (caffeine or alcohol). and there is the change in sleep pattern too. 

My big stress this holiday will be our only child, daughter, and her Aussie husband and our 3 grandchildren will be moving for good back to Australia on Thanksgiving day.  I usually have giant headaches on the holidays anyway because I get anxious about those relatives who don't get along all being there together.  I am already stressing and taking too much medication because of my daughter.  But what can I do?