I have done this with our local Chamber at our monthly local concert @ Holloween time. There were lots of kids and the parents took our brochure - some asking many questions. Has it brought me any business - not a penny, at least that I know of. But it was fun and the kids really enjoyed it. We do not have many come to our door as we live in a rural area - too far to walk between homes.
So my thoughts are do this because you WANT to have fun and provide smiles to children's faces, then any benefit you get after that is happily welcomed.
Note to Arkie - I have had some wonderful guests that are locals.... you just never know! We have had locals that needed a place because their AC went out, locals that have small children but needed a break - just not far from home, locals for honeymoons, etc. Then there are the locals that send you guests from out of town - most of the time we never see the locals, but if so they come by because they want to see the room. These guests are usually repeats and have become part of our family as well. I can count on one hand (with fingers left over) the number of times we had extended local visitors due to guests - and we are in our 12th year.