開催
かいさい · kaisai · JLPT N1 · noun
meeting
🎪 開 (open) + 催 (host an event) = open and host a meeting or exhibition
催 means to hold or host an event, as in 催し物 (an event). 開 means to open, so 開催 means opening a gathering to hold it.
催 — person 亻 + 崔 (cuī, phonetic)
催 is a semantic-phonetic compound. The person radical 亻 gives the meaning, since urging or hurrying is something one person does to another, while 崔 supplies the sound 'cui'. The original sense was to press or push someone to act, which broadened to today's meaning of urging, hastening, or prompting.