I agree with you, i tried to propose a original event but as always tecnhical problems. And if you could see in my sign, there is two events proposal: Valentine and Pop vs Rock (which i'm still uptading it).
The Pop vs Rock is another version of Police vs Punk event 2016. I wanted a original and no thematic event so i made this one. You can help me about that one if you want. I made this one because i was bored of these copy and pasted event.
I've in fact proposed a Xmas event for the last year (2018) which i asked to bring back Chloe's dungeon but as you have see in the Xmas event the dungeon weren't here cuz technical difficulties like always.
It made me understand that the staff does have a limit about events. They can't handle big thing like this. That is kinda stupid because this dungeon were here in Xmas event 2016. I'm personally dispointed that they just done a copy and pasted event again but they followed somethings of my suggestion at least.
You're right about "Grind events" but "Event with a proper dungeon" are impossible (can be possible) due to technical problems. I'm not a staff so i can't judge them and there is the problem that there is no really a lot of transparancy (That they should to give more informations about them, coding etcc not like "We're having technical difficulties about this so it's impossible").
Well that conclude my point of view and don't hesit to pm me or etcc. (Sorry for ainglish ofc)