The Christmas Eve Launch is an event that happens in Rudolph the Red-Nosed Reindeer: The Movie. As it's name suggests, it takes place on Christmas Eve. It happens twice in the film.
The first takes place midway through the film when Santa Claus and the then eight Flyers take off to deliver the presents, whilst being watched by the villagers, including Rudolph, Zoey, Mitzi, and Arrow.
The second time is near the end of the film, where a now adolescent Rudolph uses his nose's light to guide Santa and the Flyers through Stormella's storm.