On Are 終わる and 済ませる synonyms?, there were some questions whether 終わる is used as a transitive verb.
Space ALC seems to have a few results for を終わる, but far more for を終わらせる and を終える. Looking at sense 4 of the Daijisen definition, it does seem 終わる can be used as a transitive verb:
しまいにする。終える。「会議を―・ります」
My question: How often is 終わる used as a transitive verb and when is it used in such a way compared to 終わらせる and 終える?
を終わりますis used by the organizers/hosts to conclude some event etc. That makes a lot of sense to me. – cypher Mar 20 '12 at 04:43