As always it's good to note that not everyone works through the weekends and holidays. Even your local merchant needs some time off.
Before heading out to your fave bookstore or cafe, check their hours.. more than likely the places on Main St. may very well be closed for Labor Day. In the case of some shops, such as Metropolis Books, they'll be closed on Sunday & Monday after their author event Saturday night. Another place I noticed will be closed on Monday is Blossom Cafe..
If you aren't going out of town it may very well be a quiet weekend. Enjoy. ;)