Shulchan Arukh, Orach Chayim 525/שולחן ערוך·אורח חיים תקכ״ה

11. The Law of Lending on a holiday, 2 Seifim: A loan made on a holiday can be claimed (and see above chapter 307 paragraph 11).

22. The charity collectors may collect from the yards on a holiday, but they should not make announcements as are made during the week. Rather, they should collect quietly, put it in their bag, and distribute it to each neighborhood individually.