No, they have NO obligation to reimburse you or return the gifts. What you gave were *gifts*: they do not impose or contain any legal obligations on the recipient to do anything. Whenever you give a gift to anyone, there is the chance you will have a falling out--that is life. But a gift is not a contract and the other person does not legally have to do anything for it. This was not like paying for tickets for a theatre or cruise, where if you pay, they have to let you attend, and you can only attend if you pay; rather, if invited you can go without giving any gift (or giving a gift which costs only fraction of what your "seats" at the wedding cost). You may feel like there was a quid pro quo, but legally, there was not.