Well, if your event hasn't happened yet, you could always get one of these:
https://www.amazon.com/Beachtek-DXA-...6448 6&sr=8-4 That gives you proper XLR mic inputs, way more robust than the stereo mini headphone type plug, plus a headphone jack with volume control, easily accessible trim pots, phantom power, switchable input levels, and switchable mono/stereo. the linked one is a bit spendy but you could get something servicable for a lot less.