It tells when does the Pumpking disapper, which is certaintly after the event ends, ppl still have coupld days (depending on the bar) to exchange Goodie bags. According to the Changelog: Holloween posted by Kyu,
Features
Halloween has returned to PokeMMO
Halloween 2020 will run from 30/10 until 05/11
Beat up children and steal their candy. Feed the pumpkin to win a prize!
(Players will have a few days to turn in candy after the event ends.)
So, that it is. Use the link below for more information about the event and the bar.