No excuses needed!
Sometimes you don’t need an excuse to be nude. In fact you never really NEED one. This purple balloon theme with Misty-Day is just all about fun while, nude, the beauty of being nude, and celebrating not just being nude, but the nude form in general.
Nudity is fun. It is the most liberating free feeling you will likely experience. Think of any fun activity, then do it nude. Feel the difference.
No excuses needed. Justification of being is not required. So if you just want to go nude with a bunch of purple balloons like Misty-Day, then just go for it. If it puts a smile on your face, then it was worth while doing it.