As we are talking about holidays and parties; let's add another one.
In Holland we celebrate Sinterklaas actually for the (young) children. On the fifth of December they get presents and sweets from Sinterklaas and Zwarte Piet who come to Holland with their boot out of Spain.
Maybe it is a nice idea to celebrate Sinterklaas with the whole class. We will pull little papers with everybody's name on it and buy a present and make a poem for the one who is presented on the paper. You need to buy and write something that suits to the persons hobbies, personality, actions etc.
