1) Checking into the museum. You can check into the museum at the North or South entrance at any time. Let them know you are these for the Crofts/Nunez wedding and they will give you a sticker that grants access to the museum as well as rooftop for the 4:30 ceremony. 2) Schedule of the big day The ceremony starts at 4:30 on the roof of the Natural History museum. This will be outside and will be over by 5:15. The weather is supposed to be sunny and in the 60s. The cocktail hour and reception will be inside. The cocktail hour is on the 1st floor immediately after the ceremony. Reception begins at 6:30 and is located at the bottom floor atrium. 3) Things to do at Balboa Park After you check in at the Natural History museum you are free to wander and check out the exhibits. Here are some other attractions you can walk to in Balboa Park: https://citybop.com/san-diego/balboa-park 4) Where to park There is a small parking lot next to the SD Natural History Museum. The next best place to park is behind the Fleet Science Center. Route to either of these for the closest parking. There is also limited street parking, or park by the Carousel / Zoo for a slightly longer walk.