just say thanks for everything they’ve done. [if anything] also mention a nice thing about them or a happy event you guys had together and wish them luck for the future.
The guests for coming to celebrate with us good luck many years of happiness thanked the guests for coming to celebrate with us good luck many years.
The guests for coming to put up with us good luck many years of happiness thanked the guests for coming to put up with us good luck many years of happiness.
My brother in law did that way know he said something like now somebody else has to put up with us good luck many years of happiness thanked the guests for coming to put up with us good.