Rainbow Season is my kindred's end of summer ritual. Since summer is monsoon rain season the end of summer is rainbow season. We honor the mermaids in the summer and Heimdall at the end of summer. Heimdall was Tom Newman's patron. I don't know if we're going to keep doing that in future years but we're at least doing it one more time, this year, in honor of Tom. It's also 1 year since he died.
Heimdall is the Guardian of the Rainbow Bridge. The Rainbow Bridge is the path that leads from Asgard to wherever the gods want to go. When the end of the rainbow touches down on Earth (Midgard) it only goes one place, to Asgard. The gods can bring dead people to Asgard via the Bridge if they wish to select specific humans for that honor.