This year Tisha B’Av is on a Thursday. At what time on Friday is it permitted for me to open the pool for swimming in the bungalow colony?
After chatzos. רמ"א תקנ"ח א, מ"ב ג - משא״כ בדבר שהוא לכבוד שבת, ראה בשאלה 10256: https://asktherav.com/10256-can-one-get-a-haircut-on-motzei-tisha-bav-when-it-is-thursday-night-or-is-it-better-to-wait-till-friday-morning/ #10267