Last year, Rome launched a nighttime light show in the Imperial Forums (Fori Imperiali) at the Forum of Augustus. This year, it's not only bringing the Forum of Augustus show back — it's also starting a second one, at the Forum of Caesar. (Both will run from 22 April to 30 October 2016).
I did the Forum of Augustus tour last year. It was excellent. I'm sure the Forum of Caesar tour will be the same.
What makes these light shows/tours so cool? For one thing, both lead visitors through usually-inaccessible archaeological sites: the Imperial Forums, which were built by Caesar and the emperors who followed him and which, unlike the Republican Forums on the other side of the Via dei Fori Imperiali, you can't buy a ticket to wander through. Instead, usually, all you can do is peer down at the Fori Imperiali from the road. (Or from the museum at Trajan's Market).