Migrated calendar events don't appear in some views
If you migrated any calendar module(s) and the events don't appear in the Month, Month List, Week, or Day events, HOWEVER, they appear in the Upcoming Events or Administration views, you will need to set the site's time zone to the time zone used on the old site. You can do this using the Display tab of Site Configuration.
Fix: this anomaly is fixed in version 2.0.9 or later. Otherwise, the only work-around is to use/select the same time zone under Site Configuration as the site the events were migrated from.