So hey lets go back to outlook and restart it maybe it will show now. Bam shows up in OWA without issue all events are there in all of their glory. So removed the shared calendar, go back to the share email and click add calendar. But just for giggles lets remove it and re-add it through OWA.
Log into OWA open the calendar and sure enough blank there as well. No it shows up and appears to connect but there are no events on the calendar its completely blank. Select the level of Details you want them to see: Availability only, Limited details, Full details. In the To field, enter the e-mail address for the people you want to share with. On the 2007 client open the calendar and select open other users calendar > click names and find the user you are sharing the calendar of and done calendar shows up right? In Outlook, you can share your calendar with other people, request to view theirs, and select which details you want to share.
This is made slightly more difficult because this is shared from Oulook 2013 to 2007 so you have to manually add the connection.
Right click the calendar > Share > Share Calendar > Pick a user to send it to and send it on its way.