This is copied from Becky Choi & Teddy on FB. It is interesting.

I don’t know how to explain this properly, but thanks to “R”, they provided us with a list of “hidden events” that’s not going to show up on the event calendar until they start.
It is NOT from a cheating app. In fact everyone has it on their device it’s a matter of knowing where to look.
Anyway here is the list that was given to me and it was accurate for the new theme (world of cinema) as well as the event point bonus that started today.
8/8 - Need for Seeds
8/13 - “EventScoreBonus” <— hidden8/20 - Harvest (Advanced Agriculture)
8/22 - “CoinsBonus” <— hidden (I believe that is Double Reward special offer event)8/25 - Restaurant (Fast Food Stars)
9/2 - Mine Time
9/2 - “ThreeChestEvent” (coming next update I think, possibly a new event OR the Big Screen Adventure event that we previewed in last beta??)
9/3 - “OreBonus” <— hidden (Ore Galore)Now the rest may be part of the next update and I’m not sure if it will still be accurate after we get the update but here they are anyway:
9/7 - “OreBonus” <— hidden (Ore Galore)9/9 - “Knife” (I think Tropical Blends)
9/14 - “MagicBeans” (wth? Lmao I dunno what this event is, have to wait and see)
9/17 - Factory (Industrial Boom)
9/17 - “CoinsBonus” <— hidden (Double Reward?)More to come as we find out more...