A hashtag is important. Not only for weddings but for events and collections of posts. It's important to be specific if it's for a wedding, otherwise you'll click on your tag to find dozens of pictures from another couple's wedding. Our's was #johnloveskarissa, and though not super creative or out of the norm, what are the chances of another couple with the names John and Karissa? (Sure it's possible, but not very likely.)
I began posting under the hashtag long before the wedding day. The first post in the tag is a diy I did for the engagement party! I plan to continue to use the hashtag when referring to John and I on social media or when posting throwbacks to the wedding. I also use the tag here on the blog with posts surrounding the wedding!
Are you getting married or recently married? What is/was your hashtag?