How do I remove meetings from my home screen that others have made me host?

Glenn,

Short answer is there isn't really a simple solution to remove them from your homepage.

If you (as an Admin), or a different Admin of the account, finds where those rooms are located (either in the User's meeting folder or someplace in the Shared Meeting folder) and either delete the rooms or change your predefined permissions from host or remove you as predefined user, then the room should be removed from your home page.