I'm getting over a cold (cough, sinus congestion, etc.) but my band is playing a show tonight and we can't cancel. It doesn't hurt to sing and my throat isn't sore but I'm still a little apprehensive about pulling this off. Any tips on singing while sick?

"Art is always and everywhere the secret confession, and at the same time the immortal movement of its time."

If you make sure you nose isn't blocked up by using vapour rub or other such things, to ensure you don't sound nasally, then I think you'll be fine. You should just be left with a bit more bass/gravel in your voice from the croaky voice you tend to get whilst ill. Might turn out okay.
Proud owner of an Engl Thunder 50 Reverb and an Ibanez S470

"The end is extremely fucking nigh..."
Decongestants and paracetemol. Cough syrup too if need be.

Or Lemsip, if you know what that is.
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OddOneOut is an Essex S&M mistress and not a pirate or a computer program.

just make sure your nose isnt blocked (vicks etc) there is nothing worse than a nasally singer.