I was level 70 or higher and played completely without masteries ...  

I am honestly more concerned about this right here my dude

Seriously though, I think a Forge event may be cool. Not entirely sure about the other ones (Mino, Keeps).

Tons of players have asked for a Minotaur Event in the past.

The game has never done them.

I still believe the idea of having a Minotaur Event is great.

I, personally, would love a Minotaur Event.

I have tons of heroes which need Scrolls.

It would be amazing to farm Scrolls while gaining rewards from a Minotaur Event.

Yeah - That's exactly what I mean. 

A Mino Event would lead to more attention on the Mino Dungeon. 

e.g. I would do some of the masteries just for fraction war champs. But without a event, it's not woth it.

Could not understand why such an important part of the game don't get an event. 

And to be honest, more different events = more fun. 

After a while it's kind of boring to just run dragon, figher knight and spider ... repeat.