The first time I went to a family holiday, I brought my own food, along with a dish to share. The 2nd and 3rd times, I ate food I thought would be safe because everyone was pretty tuned into the program. I was horridly sick for a week after the 2nd and 3rd holiday family events.
I thought my family would be appalled by my bringing my own food, but even though they teased me a little bit on the first holiday event, I'd take getting teased over getting gluttened any day of the year.
It's about you being there, not about the food. It really is, no matter what.