from my own experience of these things...
you won't feel tired the next morning...
liklyness of the thing is the adrenalin will still be running from the night before, adn the next morning you'll be fine to get up that early.
i have gone to parties many a time at which i've got 4 hours sleep before having to get up and work 8-5 at the riding school yard...
i was ill later on during the week, but hey, i got through the day fine!
i say DO EEEEET!!!!!!!!!
because it's friking GAZETTE MAN! *is listening to them now*
you are SO lucky to get this opotunity!!!!!!!!!!!
however reading what you said about the tickets...
well, like Kinsao said, you seem to have pretty much got your mind set, which is good.
i wouldn't spend more money than you have on them because also in my experience getting home can end up costing more than you exspect (even if you think you've paied everything already) >.<