How do I add an extra hotshoe to my canon t2i/550d?

I shoot a lot of video at night venue's/concerts and I'm in the market for a nice shotgun mic for my camera. Problem is I often need my light mounted to my hot-shoe and all of the mic's I'm finding mount to the hot shoe as well and none of the Mic's I've seen come with an additional hot-shoe... show more I shoot a lot of video at night venue's/concerts and I'm in the market for a nice shotgun mic for my camera. Problem is I often need my light mounted to my hot-shoe and all of the mic's I'm finding mount to the hot shoe as well and none of the Mic's I've seen come with an additional hot-shoe or a bonus adapter to have more than 1 thing. where/how can I get an adapter to have my light and my mic mounted simultaneously? It needs to be something that allows me to be mobile also like a rig, I also would like to have the light on top and the microphone on the side if at all possible.
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