開催， かいさい
1. holding (a conference, exhibition, etc.), opening, hosting (e.g. the Olympics)
举办(会议、展览等)；开幕；承办(例如奥运会)
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催す， もよおす
1. to hold (an event), to give (a dinner, party, etc.)
2. to feel (sensation, emotion, call of nature, etc.), to show signs of
举办(活动)，举办(晚宴、聚会等)；感到(某种感觉、情感、生理需求等)，表现出某种迹象