SharePoint calendars are being wonky for some people. We tried to clean up and streamline some of the groups/permissions in SharePoint. In doing so, it appears not all our lists (which includes things like calendars) were originally set up the same way with ownership and permissions, at the site level. A handful of these lists are locked from editing now. Some will affect no one besides LibIT. Some, like approving time-off requests, are temporarily disabled until Campus helps us figure out how this thing got set up years ago.