In the US, they found that Trump's open-air rallies were usually superspreader events. Even though the open-air would reduce transmission, it wouldn't eliminate it. The fact his supporters refused to wear masks or social distance helped the Delta variant beat the odds.
EDIT: It probably wasn't even the Delta variant back then. It was probably the original Covid or the Alpha variant: much less transmissible and yet it still turned Trump's rallies into superspreader events. Imagine what the Delta variant would have done ...
What would you consider a bigger super spreader?
The 5000 dick heads walking around the city the other day or the infamous engagement party?