PLEASE PLEASE feel free to suggest you own mini events to happen in haven or the arcade. The main point of these events are to add more flavor to both the arcade and haven more then just "we got dem amputee burds".
I will try and keep track of all suggested events Here, or at least the ones I feel are worth having and are not broken.

Hooded Figure
This event will take place in either the Arcade Haven Plaza, or the Grassion/guildhall area. A hooded figure, most likely a gremlin, will be seen running from some thing before disappearing. Some times the figure may have a sack on his back. If he does there can be a chance of him dropping some thing form a random low star recipe, low tire materials, or minerals. Any drop goes to the person who picks it up, no one else.
Just a heads up, I have my cupcake looking in the direction of were I am talking about for each screen shot.
The fallowing can function as "starting" points for the little hooded figure:
Grassion into Arcade
The little guy comes running from the grassion into the arcade.
Roof top Jump
Our little hooded figure appears behind the building up there, then jumps down behind the energy Stranger then goes running around haven.
Bazzar into Arcade
The grem comes running out of the bazzar into the arcade.
Haven to arcade
Runs into the arcade from haven plaza.
From around the wall
The Robber comes form be hind the wall, then jumps over the little wall then goes run around the grassion area with a bag full of recipes.
Possible end and start
This spot can work as either a start or end at this point. The gremlin will jump over the wooden bars and push over a knight/gaurd.
The jump
For this end s/he takes a leap of faith, similar to the dash, and clears the jump to run off into the forest area then off screen were it de-spawns.
Can drop some thing when it jumps.
Over and out. between buildings.
For this exit the Grem jumps over the small wall/ledge and then runs off in between the two buildings then despawns.
LOOK ALIVE!
For this escape the grem jumps over the ledge and lands on that unforunet knight causing them to go into the prone/dead mode that NPC knights go in when they "die". The grem then runs off in the same direction.
Secrets in haven..
This one is my favorit. He either does a lamer but still cool jump flip on top of the statue then over onto the higher ground to run off into the forest OR the statue moves back, revealing a small hole were he jumps down before it goes back over. The hole in ground can only proc if there are no knights within that area, or at least near the statue when he enters.
Over and out. Grassion.
For this one he jumps the wall and down into that little area.
Down to Kogmo!
He runs inbetween the two.. gates? I dunno what they are called. Either way he goes down that little shoot, maybe even slides down the shoot.(?)
Under the empty lott
He dives under that little area and goes down the shoot.

I think what I have is a good start. Feel free to suggest your own. I will add more latter.