Just for the sake of getting you the three posts that seem necessary to stimulate interest, I can report that one very large biker club near my home does have multiple elaborate banners proclaiming their club name.

Since they're also a "vets club" subgroups also frequently show military (unit) banners as well.

It's rare to see enough of them in one bunch to bring out all the gear except at "official parades" though.

One moderately popular band here a few years ago liked to play "behind a banner" but it didn't have a name on it so we guessed it was just so that the audience wouldn't notice that the xxxxx player's socks didn't match (or that he didn't have shoes on).

John