You had me at 'autonomous blimp'
Sadly, it sounds all artsy-fartsy with the blimps moving towards sound or somesuch. Sigh. If your autonomous blimps can detect and move towards sound, at least let paint the target with a laser sighting device to instill an appropriate feeling of dread.
\<a href="http://www.knowing.net/images/Youhadmeatautonomousblimp_A324/image05.png"" atomicselection="true"> Plus, the party's being held in a wind tunnel, so that doesn't make these things sound like they could do much to prevent escape from The Village.
If I had an autonomous blimp (how many times have I typed that phrase over the years?), I would outfit it with targeting lasers and set it to work discovering the calling places of the invasive coqui frog, a dime-sized creature that produces a 110 dB (!) whistle.