[Partial Revert of r49573]Revert of '[bp/r49561][ENH]Added calendars and their events to the module since_last_visit_new.'

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/9.x@49663 b456876b-0849-0410-b77d-98878d47e9d5