Clover (not to be confused with Thomas Glover) is not native to Japan and was introduced through the port of Nagasaki. This year the city named MomoClo their "Clover Ambassador". I don't know if the title existed before.
It also happens to be the 60th anniversary of the Nagasaki Broadcasting Company. I don't know if it's state-owned.
Who knows which side wanted more than one group, but it's certainly easier to organize with just one agency.
Clover Expo will be held today. Big typhoon is approaching the vicinity of the venue. Because the open-air live, I'm worried. Kawakami will not be blown off by wind. /yup