you must attend one Mass on Christmas eve or Christmas day, with readings for Christmas, and another Mass on Sunday, with Sunday readings (feast of Holy Family). Most parishes will not have a Saturday evening Mass with Sunday readings this year, but you need 2 Masses this weekend. In our diocese, News Years Day is not a Holy Day of obligation (the Saturday/Monday rule) so we only are required to go on Jan 2, Epiphany. There will be a regular 7:30 daily Mass on 1/1, and an additional 9 am Mass, as per regular Holy Day Schedule, but attendance is not under pain of sin for missing it.