I was at the Polynesian in late January and early February, and they were passing out wristbands like candy, but only on Friday, Saturday, and Sunday. I was using my DVC pool hopping privileges, and when I inquired "why the bands now?" after not on Tuesday, a very nice cast member, who remembered me from before explained. In very non-Disney terms, he said that people who weren't staying on property at all, were riding on the Monorail around from the Magic Kingdom, and swimming, then heading back to the park for the evening. Locals it sounded like, who were familiar with the lay of the land. He said they mostly had problems on weekends and Grad Nights (weird, I know). So he banded me and my four-year-old niece, and that was the end of it. He said they "wouldn't normally inconvenience you, but I want you to get what you pay for."