I would only tape in a very light rain shower. Very, Very Light. Anything else, it would come down.
I would think you gotta have rocks in head if your going to Texas this weekend. Even though Austin is not on the coast, your still going to get Hurricane or Tropical storm force winds. Even 20 or 40 winds when fuck up your day pretty good. Sideways rain and all.
Off the ACL Website:
Update on Hurricane Rita & ACL
Just like you, we are keeping a very close watch on the weather and are being advised by meteorologists. We do expect some rain on Saturday, so be sure to bring an umbrella and wear your rain gear.
If weather conditions appear to present any kind of danger to fans, musicians or crew, we are prepared to make the necessary adjustments to maintain safety. Until then, the Festival is on, rain or shine. Look here for updates.