1 or 2 weeks where everyone gets full DEC gear / max alch stones

(not sure if crystals should be added, may cause problems)

combined with PvP events like:

 -Garmoth type of boss (takes a while to kill with big, wide space that can be used as an arena) on the Anonymous Arsha server (so it is harder to make 1 side alliance and camp it) with a random spawn time window, with a chance to get rare drops like Edana fragments, so People pvp for it for a week or two only (more than that may get organised camping)

 -Normal RBF events  and other PvP events that we have atm like NW and so on

 -War of the Roses event:  outside of normal War of the Roses time fights where people just sign and get paired randomly like in RBF

Something like this may help:

 -to test how classes feel after class rework or before that

 -It may motivate old players who were unhappy with old patches or tired of grinding and stopped playing to give the game another try.

 -Show the newer players what the endgame feels like

I played an MMO before BDO more than 15 years ago. There was a Christmas event where everyone got red glow-enchanted weapons (endgame at the time) server was split into two big factions. Bosses in that MMO had a random window to spawn, not a set time. The 2 factions PvPed for that boss for 8 hours! It was partly for the drops, partly for pride who is better, but it was the most fun fight I have ever seen :)