-what time of year in Scotland where they call it “the roaming”?

Question

is it even a time of year or is it a myth?

Answer 1

I think you mean "the gloaming" ... there's a famous Scottish song "roaming in the gloaming" .... gloaming is the half light  late in the day after the sun sets but before it's completely dark ... so roaming in the gloaming means going for a walk at twilight