If it matters, the least you can do is show up.
And if you’re going to show up, you might as well bring the energy. If you’re the convener, your audience will appreciate it. If you’re in the audience, the convener will really appreciate it. (Your peers probably will, too.)
People are hungry and thirsty for positive leadership. Go first, put on a show, and give kudos. Inspire the others to do the same.