"Hello there, my family and I will be in Pattaya on xmas day and are trying to find out if any pubs do xmas lunch, or if any of the malls have something chistmassy going"
I don't know if you realise, but Thailand is a Buddhist country, not a Christian country. They don't celebrate Xmas here.
Malls - yes, they've got Xmas trees there. Is that "Christmassy" enough for you?
Lunch - there's always loads of places that do lunches and buffets. Just pick what you like.