As the saying goes rain on your wedding day is "good luck" and since it's out of your hands the best thing to do is smile and roll with it. You can always add additional tents and walkway marquees, but try to make it fun with a good attitude. Some of the things we've seen are ushers, ushering in the guests with large umbrellas or handing out umbrellas. You may want to keep an eye on the ring bearer as he may get a bit carried away in the puddles, but seriously take after him and enjoy yourself. be sure to take photos with the bridal party all holding umbrellas in the rain or a photo with just the lovely couple cuddling under one. Another tip is don't wait for it to rain to start your umbrella photos, if it looks like it's going to rain beat mother nature to the punch. - Good luck...you'll need it that is if it doesn't rain.! ;)
There are 10 packs of Wedding White Umbrellas available on Amazon.