開催【かいさい】
holding (a conference, exhibition, etc.), opening, hosting (e.g. the Olympics)
主催【しゅさい】
sponsorship (i.e. conducting under one's auspices), promotion, organizing, organising, hosting, staging
催し【もよおし】
event, festivities, function, social gathering, auspices, opening, holding (a meeting)
催す【もよおす】
to hold (an event), to give (a dinner, party, etc.), to feel (sensation, emotion, call of nature, etc.), to show signs of
催し物【もよおしもの】
(program of) entertainments, special events, exhibitions, amusements, attractions
催促【さいそく】
pressing, urging, demanding, demand
催眠【さいみん】
hypnosis