The schedule has been updated. Here's a repost:

Event: Start: End: (ALL TIMES EASTERN)
Hobnanigans 1/5/17@10am 1/9/17@3am
25% Skirmirsh Mark 1/12/17@10am 1/17/17@3am
25% Crafting XP 1/26/17@10am 1/30/17@3am
Hobnanigans 2/2/17@10am 2/6/17@3am
25% XP Boost 2/9/17@10am 2/13/17@3am
Yule Festival (encore) 2/15/17@10am 2/23/17@3am
Lootbox Drop rate increase 2/23/17@10am 2/27/27@3am
Hobnanigans 3/2/17@10am 3/6/17@3am
Buried Treasure Event 3/9/17@10am 3/13/17@3am
Spring Festival 3/22/17@10am 4/3/17@3am
Hobnanigans 4/6/17@10am 4/10/17@3am