I had an exam for a computing subject at uni... I told the lecturer I had tickets to the Davis Cup, and I had them for aaages before hand... she let me do the exam a month later
Funny thing is, I did the exam when the Sydney / Adidas International was on! Nearly missed half of Thomas Johansson's match vs Boutter! It's not crazy I guess... it's just dedication...like cancelling flights so I can have 2 more days in melbourne.