Forgive me for giggling, Moser, it's a fair question.
There are five official picture-posting days in PLEBA:
Monday= MOOB day= Larry's day (Moob's stand for Man boobs... a bit of a bastardization of the original meaning, granted, but it refers to his ripped physique)
Tuesday= RSOC day= Adam's day (Resident Sparkoholics something something Club)
Wednesday= Leather day= Bono's day (probably self-evident how this came about, during one of his leather-wardrobe-intensive stints)
Thursday= Band Day= duh... though this is often overlooked anymore
Friday= Freestyling Friday= Edge's day (no idea where this particular moniker came from, though it suits Mr. The Edge particularly, as he is quite free-styling)
So, there you go... far more information than you ever requested or required!!