I would focus it around that idea that is specific right now to your environment. The sun is almost constant, but it won’t be for long. Darkness will begin to grow and that will carry though to the winter. Why are you thankful for that light, and why may you be looking forward to the dark? That is a pretty special environment to be in.
This is the furthest swing of the pendulum before it goes back the other way. Often, that has internal implications within ourselves as well as natural implications. You might meditate on those ideas a bit for inspiration.
During the solar festivals, I usually light a candle in honor of the sun, thanking it for the season and sending it on its way or welcoming it back once again.