DOOM Eternal has a Double XP Weekend at the end of the current event.
At the end of the “Wrap Up and Open” event, Bethesda is hosting a final weekend in DOOM Eternal where you can earn double experience points.
Until November 11th, you will earn double experience points in the first person shooter by completing levels in the campaign, in battle mode and in the weekly challenges.
Note that the bonus XP only applies to event progress and not to the general DOOM level. Booster XP is also not doubled.