Thanks for all the well wishes and advice! I got some X-rays done and thankfully nothing was fractured or broken (and the screws from a previous break did not get wrenched loose in the fall)! I've been lucky enough to be assigned to completing the tasks, favors and whatnot, where I can prop my foot up and keep ice on it. I've also purchased a nice pair of flats, because there is no way I'm falling and breaking myself day of the wedding. As for a response from the bride, she pretty much told me it took a lot longer to fall than she thought it would (I'm super, super clumsy), and to keep off my feet so I can still be in the wedding without hurting myself again.