Birthday party

From Memory Alpha, the free Star Trek reference.

A birthday party is an event held in the honor of an individual, celebrating the anniversary of the day on which they were born.

Commander Riker celebrated his birthday on the USS Enterprise-D with a birthday party. (TNG: "Future Imperfect")

In 2370, a replicant of Miles O'Brien was concerned the crew of Deep Space 9 were going to give him a surprise birthday party. (DS9: "Whispers")

Several months later, Riker wanted to give Worf a surprise party for his birthday, but Troi talked him out of it. (TNG: "Parallels")

Ensign Ahni Jetal celebrated her birthday on the USS Voyager (VOY: "Latent Image")