Author: Ryan Wyllie
MDL-59669 calendar: add validation for eventtype in event form
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6bb8889932f3d1b6e618a9c57e134292746437a3
http://github.com/moodle/moodle/commit/6bb8889932f3d1b6e618a9c57e134292746437a3
+ 3.4 en [invalideventtype,core_calendar]