i've never carb'd at warmer temps.
however, if your party isn't for 3 weeks from today...why are you sweating it at all? go refill CO2 on Monday and put it back on gas.
otherwise, prime it and remember you'll need to discard the first couple of draws as it'll be full of yeast sediment from the priming.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10