Was watching Nub's vid earlier and he was talking speculation about when things are happening and not sure when they were in his video. I know Raid won't announce them officially till like day of. 

Here's the upcoming week's events. 

Monster Path 22nd - 25th

Dragon Turn Attack 24th - 25th. 

Classic Arena 26th - 28th

Ice Golem Turn Attack 27th - 28th

Dungeon Divers 25th - 28th

Summon Rush 26th - 29th

Artifact Enhancement 26th - 28th  

 They end technically the morning of the next day from the times above but unless you are up at like 2am-5am at least for me then I consider them over on the above dates.

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I'll spoil the surprise again like I did in PriestGuardian's Monster hunter post of him wondering when things were but it wasn't being answered. Granted they could add additional ones later, but these are what they have setup currently. These are the ones that give Lunar Points as well.