I can't seem to find a way to do this - as a portal administrator, I can edit events that are posted in the events module, but is there a way to allow a user in a different security role access to edit a specific event?  They do have edit permissions assigned to the module, yet the delete and edit options don't appear. 

Thanks in advance!

I don't think this is possible, a user can edit and delete events that they create, but I don't think you can enable them to edit specific events.