another tip is, if ya know youre in for some rain, make sure there is sufficient space between stands, nothing worse than going to oppen yours and BAM, knocking into folks mics
and another tip is: put your umbrella on your stand anyway, just dont open the umbrella part, extend it tho, then if/when its needed, you simply lower the stand and POOF, open that umbrella
i personally love taping in the rain as long as im prepared, ive pulled some great tapes that way
and as for rain hitting your umbrella, youd have to have a pretty lowl evel band w/ not much noise going on, and personally, i LOVE the sound of the rain i have when moe ended their second set>encore, you can slightly hear the rain coming DOWN
then take your micsdown, keep the umbrella up so you have rain guard while taking mics/cables down, throw everything in your bag, and get the hell out of there