The art event in the park have variations depending on who you go with at the end - mike,dean,ivy,elijah.
Make save before talking to Mike and send him home and go talk to one of the 3 other characters I mentioned to get their scene. (you also have to go with mike straight home to get his scene too)
You need to load the save before Mike chat and send him home and talk to each of other characters to get all the scenes - once you do you will be able to replay them from the Gallery
P.S. I'm repeating this for the last time and people who ask for this will meet my favorite "use the search meme" after today.