In article .com,
"DABEAR" wrote:

What is the largest formation of Ultralights ever assembled for
flight, when and where was the formation held, and was the formation
held for Air Show or other purposes? Are Ultralights adept at
formation or can they be blown around to the point that formation
flying would not be safe? Is there a formation school for Ultralight
flying as there is for Warbirds?

It would depend on the type of ultralights involved. I would not trust
weight-shift machines in close formation, because of the poor
controllability.

Some of the LASSs, however, with standard controls, would do just fine.