Duh! silly question here.

I didn't have any trouble scheduling items Tues night for early in the am the 16th. Albeit, it took 7 hours for them to post....but anyway...I don't know what the pink on the calendar means.....I've never seen a "pink" calendar, for that matter I don't remember seeing a calendar. So my question is when I run across it, does it mean you can't schedule?
Apparently not according to tech support. But not sure what it is or if I should even want to know. Rooky by Karma, stll a newbie by know how.