開催[kaisai] holding a meeting
開催式[kaisaishiki] opening ceremony (of an event, show, etc.)
開催中[kaisaichuu] in session
共催[kyousai] joint sponsorship
催し[moyooshi] event

催物[moyoushimono] points of interest
催す[moyoosu] to hold (a meeting)
催淫剤[saiinzai] aphrodisiac
催合う[moyau] to co-operate (in enterprises)
催告[saikoku] notification

奇怪しい[okashii] funny
怪奇[kaiki] bizarre
奇しくも[kushikumo] strangely
奇異[kii] odd
奇っ怪[kikkai] strange

奇矯[kikyou] eccentric
奇遇[kiguu] unexpected meeting
奇形[kikei] birth defect
奇策[kisaku] clever scheme
奇習[kishuu] strange custom