no hecks, I wasn't trolling, I just forgot about google, wikipedia etc for a sec :)
Funny you guys mention this though, I just finished an assignment where I had to make a (fake) school paper, part of it was about the Christians only holding on to their feasts and not to fasting :) That was about Carnival though, not sure if we´re talking about the same thing here :P
Oh, and to answer the question you asked: No, as soon as I realize something isn´t good for me, someone else or whatever, I give it up immediately, no need to wait for a special occasion in my opinion...