a bordering of collies
an agility of corgies
a ravage of raccoons
a tiptoe of deer
a wakeup of mourning doves
Boring, but . . .
A pride of lions?
How about a pride of parents! (You know like at a sporting event or music recital, etc.)
A neverthriving of jugglers.
A gathering of Atookians.
An aggravation of actors..
an unbooking of accordionists