Years ago, Jubilee Morris Men danced at Jan Smuts airport before welcoming Coventry MM for a visit, and got moved on by the police for "Riotous Assembly" which was defined as a gathering of more than 4 people, if I remember right.
It happened just before we arrived there in the early 80s. All I know was you couldn't dance in the street without strict permissions, and most of the dance outs were private paid bookings.

And I've never heard 'em called wavers before either, even during 30 years of marriage to a cotswold dancer, who danced with 5 different sides, plus Whitby Scratch. I dance NW Morris, and I've never come across that term in that tradition, either, and there are all sorts of names for things held!

Andrea