Within your Wedding Website, you can add other wedding related event details. This could include the information about the rehearsal dinner or the brunch the day after! You'll be able to add date/time, location, meal options, RSVP options, and even a cover photo.
To include this on your website, go to Your Events page. You also have the option to not display this on your website by selecting "No" on the "Show on my website" question.