Scenerio, they had a quick pretend wedding, (on Barack Obama Seniors part) since he was already married. They hopped on board a plane to go over seas since this appears to be taken at an airport. While in Kenya she finds out about his other wives and is distraught and after Barack's birth she travels to Mercer Island to see friends. (Since that is where she shows up after his birth.)
I don’t know that it was a wedding pic. Look at this one of BO and Dad. Same setting, same suit -
http://www.kansasprairie.net/kansasprairieblog/wp-content/uploads/2007/12/copy-of-28585925.jpg