Ending August 3. The saldi (summer sales). If you miss these, you'll have to wait until January!
Ending August 8. Opera at the Baths of Caracalla (shown above). This year: Aida and Rigoletto.
Ending August 9. The "Roma Incontra Il Mondo" festival with nightly concerts at the Villa Ada, a lovely, enormous park in Rome.
Ending August 15. Rock City, a festival in the Park of the Aqueducts featuring nightly concerts and restaurant stalls. (On the smallish side, but fun).
Ending August 19. Lungo il Tevere Roma, an enormous nightly festival at the Tiber River.
Ending August 31. L'Isola del Cinema, showing films nightly at the island on the Tiber River (both foreign and Italian).
Ending September 4. Nightly jazz concerts at the Villa Celimontana.
Ending September 4. All'Ombra dell'Colosseo, a pool (with events like aperitivo and concerts) in the Colosseum's shadow.
Ending September 5. La Forma del Rinascimento ("The Shape of the Renaissance"), with works by Donatello, Bregno, and Michelangelo, at the Palazzo Venezia.
Ending September 5. L’Età della Conquista ("The Age of Conquest"), an exhibit on the founding and Greek influences of the Roman Empire, at the Musei Capitolini.
Ending September 8. Colori dell'Ara Pacis, a light show showing the Ara Pacis as it would have been. Wednesday nights only.
Ending October 3. The Colosseum's Gladiators exhibit.