[tialaramex]

It's known as TV Pickup.

Half time of a pivotal England World Cup game, shown only on commercial TV. I'm pretty sure finals (and maybe semi-finals) are always simulcast on the BBC so it's unlikely to have that commercial break element. There were a few big ones (>1GW) this century for big England games, and a notable one during COVID responses when people put a kettle on and then went outside to clap thank you to NHS workers.

But the other types of events, soap character's murderer revealed, long running drama ends, that sort of thing, are casualties of modern viewing habits - no longer a single identifiable (and potentially disastrous if not allowed for) bump.