Today, everyone who attended Frodo and Merrill's wedding received a lovely "Thank You" card in the mail with a pretty leafy design secretly drawn by Frodo himself, without any signature on the image.
Inside, there was a personalized note for each guest, thanking them for their presence on their special day, as well as for any gifts given. All the information is correct and names are spelled properly.
A donation was made in every guests' name to a charity that suits an interest dear to their own heart. How Frodo and Merrill got it so right is a marvel!
If anyone wants to actually extrapolate on their charity, feel free to do so.