Is there an effective way to sing while dealing with a cough?

I sing in a garage/punk/rock kind of band. We have practice on Sunday, and I've been coughing...not severely, but regularly, all week. It seems to have started by singing too harshly last Sunday night...I'm still learning. Anyway, is there a way to still sing around the coughing...will cough drops just make the singing harder in terms of phlegm or whatever? I don't know what's causing this one...it's a weird time of year for it to be happening if it's allergy-related.

Thanks in advance for any advice, if any can be had.