1. https://ourdoings.com/makesite.html
2. Upload your own photos
3. Send friends the link and tell them to click the "Edit" tab and volunteer as authors to upload their own. (The happy couple can volunteer as owners.)
4. Approve the volunteer applications that you get.
5. After your friends upload their photos, use http://piclens.com/ to make viewing them really slick. There's a button at the top of piclens to leave the slide show and go to an individual photo's page where you can download the full version.