Sorry Magnus, I wanted to clarify this.
I had thought "tennis shoes" were a no go unless they at least looked like leather (i.e. earth tone brown).
But from reading the rules this is what I got.
"minimum Dagorhir requirements"
1.3.3 – Non-obtrusive footwear (moccasins, earth-tone shoes, boots, sandals, etc.). Bare feet are acceptable if allowed by the event rules.
"forbidden garments"
1.4.1 - Forbidden garments include but are not limited to: blue jeans, white shoes, camouflage patterns such as military fatigues, visible T-shirts or other obviously modern clothing, and modern hats.
Does this mean if you can have gray or even blue, orange, or green tennis shoes as long as it isn't a neon color?
Personally I think tennis shoes at all break the mundane rule.
Which is why I bought a heavy a** pair of boots, so my whole garb didn't get thrown off.
Here are some of the shoes I saw:



Bear in mind this isn't a "dag" event, its just what I was referring to above.
But apparently this is legal in Dag as well? The white shoes, obviously not, but the gray pair on the bottom left?
Or the guy in the second one that has black shoes with yellow trim and white socks?