Assign each table a different anniversary year (i. table 1 would be anniversary year etc.) and let the guests at that table write notes to be opened on that particular anniversary year (a unique alternative to a wedding guest book).
If you send a wedding invitation to the President, you will receive a congratulatory letter from him and the First Lady. The White House Greetings Office Room 39 1600 Pennsylvania Avenue Washington, DC It works! I just got my letter yesterday!