i used to put the umbrella on a seperate stand, right next to the stand with the mics. taping the GD up front we would take turns holding it above the stand, or use the seperate stand. nothing like seeing 20 umbrellas clustered in the same spot in front of the board. it is also a good idea to keep a small hand towel inside your gear bag to dry your hands before you touch your gear. lastly, don't forget to unpack and dry your stuff out when you get home/hotel. leave everthing overnight on a table in a room with air conditioning does the trick.
coop