agree the event cannot be eligible by itself, but that could be a good reason that the place that hosts the event is eligible if it isn’t just a temporary set up.
I thought also long time “ah, it isn’t permanent” - that’s obvious. But it remains in my thoughts because it is greeaat for socializing, and shows a part of our culture.
Than I thought “Where is the difference between this and an ice café, which also closes its doors thruw winter?”. Is it the roof above this not permanent opened business?
But now I know, this could be perfectly eligible, every reviewer would look at it with the “not permanent glasses”, so I save my time and nominate the “normal” things (which also can be small highlights).
I think what the others are suggesting is that a venue such as ‘Town Hall Courtyard’ could be a viable, permanent venue at that location.
In support of this venue’s usefulness and value to the community, you could cite the marketplace, speech-giving, festivities, etc., that take place there. All that is required is for reviewers to feel like there is a real, ongoing use for the space.