To Host
To Sponsor
する verb
If 主催 means "host" or "hosting," the verb version of that would be to host.
主催する refers to hosting events, especially formal ones like conferences, concerts, or company parties. It's not just about "doing" an event — it shows that the person or group is the main sponsor and organizer, the one really in charge of making it happen.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will help to know the word 主催 already as well.
このイベントは市が主催するものです。
This event is hosted by the city.
うちの学校で土曜日にカラオケパーティーを主催するんだけど、よかったら来ない？
Our school is hosting a karaoke party this Saturday. Would you like to join us?
ワニカニが漢字合宿を主催したら、参加してくれるユーザーさんはどれくらいいると思いますか？
How many users do you think would join if WaniKani hosted a kanji boot camp?
近所のおばあちゃんたちがビンゴ大会を主催してくれたんだけど、一位の景品は金の入れ歯でした。
Some elderly ladies in the neighborhood hosted a bingo tournament, and the first prize was gold dentures.