Dexella posted today that there will be a sizable discount in the marketplace as well as Bonus Experience for the holiday weekend.
From the EQ Forums:
Prepare yourselves, Norrathians – something extra is coming your way!
Looking to snag yourself some items from the marketplace? From 12 PM PT on Friday July 1, 2016 until 12PM PT on Tuesday, July 5, 2016, All Access members will receive a 40% marketplace discount!
In addition, ALL players will be awarded 76% bonus XP, Faction, and Rare Spawns for the duration of the extended weekend!