Ok guys so I have this idea that the Skywings celebrate the sun and the sky. So they would through this huge festival on the summer solstice because its the longest day (day light) of the year and that would be the day the sun is out the longest. However this festival was dropped during Scarlet's rein and because of The Sandwing Succession War. Once Ruby became Queen she brought the festival back. During the festival the Skywings would paint their scales bright colors and then they would through a feast with music and dancing.