Each year from 7 December to 10 January, Eugubini volunteers stretch 850 lights and seven kilometres of cable up the side of Monte Ingino to form a Christmas tree visible across the whole valley. It is 750 metres tall and 450 metres wide at the base, with a comet star of 200 more lights crowning the basilica at the top. Best seen from a distance — the Perugia-Gubbio road, or the viewpoint at La Lecceta, gives the full effect.
A short, perfect example of the kind of thing Eugubini will do.