主催【しゅさい】
sponsorship (i.e. conducting under one's auspices), promotion, organizing, organising, hosting, staging
開催【かいさい】
holding (a conference, exhibition, etc.), opening, hosting (e.g. the Olympics)
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