Only administrators and Philanthropy Liaison's can disable Philanthropies.
If you would no longer like for a Philanthropy to show up on the list of Philanthropies in the Hours section, but would still like to retain it's information for reference you can do this by disabling the Philanthropy.
You'll first want to login to your ChapterWeb account and go into the Philanthropies tab. Once in the Philanthropies tab you'll be able to browse to the Philanthropy you'd like disabled. Click on the top right hand corner where it says "Edit Philanthropy."
Once the edit options have appeared, scroll to the bottom and click on the "Disable" check box (see screen shot below).