Depending upon the type of favor you have - here is a suggestion.

You can use little tags that have a hole punched into them a put a ribbon through the tag and attach it to your favor. On the tag you can have your names and wedding date.

Or... as I know a few brides have done, they use the tags attached to the favor as place cards also. So the tag would have your guests name and table # they are sitting at, and its attached to the favor.

Good luck!!
Wedding, Bridal & Baby Shower Table Cards, Place Cards, Favor Tags, Note Cards, and Programs