In China Region, the midsummer date is from June 21 to July 28

After today, Questie doesn't provide midsummer quest hint (include bonfire) in map and minimap.
I recommend to fix Questie/Database/Corrections/Holidays/QuestieEvent.lua

add something like

if GetCurrentRegion() == 5
["Midsummer"] = {startDate = "21/6", endDate = "28/7"}

Great idea @Mini-Dragon