Every planet is going to have its own holidays that are not celebrated anywhere else. Why not have the players land just in time for a holiday diversion. d66 Planetary Holiays gives you 36 names and ideas of holidays you can use in your name game session.
14 Authority Day, marking the execution of rioters and the silencing of resistance
25 Dragon Ship Festival, ships are decorated as dragons and fly around
46 Incorporation, day marking the start of the corporation