One of my late season observations was that my hummingbird feeders were attracting painted lady butterflies and bees. Since the hummingbirds were gone, I took off the top of one of my feeders and put in some plastic landing pads.
As you can see above, butterflies and bees are both attracted to this feeder. I am still using the 1 to 4 ratio of sugar to water. The bees will drink the liquid within an hour.
As you can see in the video below, it does get rather busy, but the bees paid no attention to me and were not aggressive at all.