Even when we have clouds, the Crossroads solar collectors work, but the electrical output is much greater on bright sunny days. On bright summer days, tree leaves collect the energy of the Sun and convert it to sugars. But on sunny days, until the leaves drop, sugars still build up in the leaves. Meet at the Collins Learning Center, Crossroads, 2041 Michigan, Sturgeon Bay. Meet at the Collins Learning Center, Crossroads, 2041 Michigan St., Sturgeon Bay.