Jehovah's Witnesses do not celebrate religious and political holidays. The also don't celebrate Christmas, New Years, birthdays, Mother's Day, Father's Day, and all the other days that are special to most of us.
The only holiday they celebrate is the yearly anniversary of Christ's death, i.e. the memorial day celebration. However only those who are part of the 144,000 with the heavenly hope take part in communion. Others merely observe out of respect. The wine and the bread is passed around each congregation but quite often no one partakes.
Watchtower Quote: '144,000 faithful Christians to go to heaven. ... Who should partake of these Memorial emblems? Logically, only those in the new covenant—that is, those who have the hope of going to heaven—should partake of the bread and the wine. God’s holy spirit convinces such ones that they have been selected to be heavenly kings.' WT, 'What Does The Bible Really Teach?', 2005, page 207. ( Highlighting added. Notice how the Watchtower would like us to believe the 'Holy Spirit' selects the 144,000 who go to heaven. Evidence suggests that the Watchtower decides who goes to heaven based on obedience to the organization. Watch this video )