While the library does not give out candy, if you go up to the circ desk and say "Trick or Treat" on Saturday, they will lend you a book for free.
The Cat in the Hat was shelving books in the Zoological Science section today.
The library's early literacy workstations have inspired one little girl to dress up as Stellaluna this Halloween. Stellaluna is the story of a fruit bat that gets separated from her mother (something we hope does not happen to the costumed Stellaluna).
Years ago at another library I once wore butterfly wings on Halloween, a decision I came to regret whenever I was called on to answer a serious reference question that day. Dressing up some year like a retro librarian with snazzy glasses and sensible shoes is still a possibility.