No need to wait until lvl 50 
“By the Light of the Moon” can be done at lvl 40
“Thirst of the Serpent God” and “The Shambling Plague” even at lvl 20
more info at: Halloween Events Guide
No need to wait until lvl 50
“By the Light of the Moon” can be done at lvl 40
“Thirst of the Serpent God” and “The Shambling Plague” even at lvl 20
more info at: Halloween Events Guide