we have celebrated Xmas and New Year for many years in LG/PS. Xmas is low key. We have enjoyed Christmas carols which are lovely. If you want you can have Christmas dinner etc. New Year is fabulous with the celebrations in the square. Three Kings night on 5th January in the square is a really special night to join in with the locals celebrating. My personal choice is Christmas at home, then New Year in Los Gigs.
Any time in Los Gigs/PS is special though as I love the place.