This year on June 3, 2023 at 0000 UTC through 2359 UTC June 4, 2023. For those in the Eastern timezone that is from June 2nd at 8 pm (2000 hrs) through 7 pm (1900 hrs). There are different award categories for Activators and Hunters also there is a Club award section. All bands and modes are allowed with the exception of the WARC bands of 60M, 30M, 17M, and 12M.
If you want further information it can be found here.