Happy birthday to the world's most fascinating, historic, and beautiful city (yes, I'm biased): Rome! Tomorrow, April 21, marks the city's 2,764th birthday. (Although by now, who's counting?)

That means, of course, that Rome's going to celebrate in style. Including with free museum openings, shows, and other festivities.

At the top of our list of free, fun ways to celebrate Rome's 2,764th:

All day. Free museums. Rome's municipal museums are free, including great, off-the-beaten-path gems like the MACRO, Montemartini, and Ara Pacis. Here's a complete list of free museums on April 21 (in Italian).

9am. Ceremony with Rome's mayor, Gianni Alemanno. Rome's mayor lays a wreath at the Tomb of the Unknown Soldier at the Vittorio Emanuele monument, Piazza Venezia. Pomp and circumstance ensues.

11:30am. Concerts at the Campidoglio. Today it might be best known for Michelangelo's architecture, but back in the day, this hill was one of Rome's most sacred. Stop by for some music while the Granatieri of Sardinia look on.

11:30am. Reenactment of Rome's founding. At the Circus Maximus, the Gruppo Storico Romano performs the tale of Rome's 753 B.C. founding. Who will you root for: Romulus or Remus?

3:30pm. Inauguration of the "Bridge of Music." The bridge, in the Flaminio neighborhood near the MAXXI and other cultural gems, gets inaugurated to the sounds of the band of the metropolitan police corps.

4pm. Concert at the Capitoline museums. At 4pm, the Orazio Vecchi choir will give a free concert in the Pietro da Cortona room. Arrive early to get a seat.

6pm. Historical reenactment of Palilia. In front of the Bocca della Verità, the Gruppo Storico Romano will "perform" the pagan Palilia ceremony, a celebration of spring's arrival that Romulus himself was said to have participated in.

9pm. A "spettacolo" of light projections, performances and music. At 9pm at the Forum of Augustus (in the Imperial Forums), there'll be a show called "Roma/Amor, the birth and resurrection of the Eternal City," celebrating Rome from 753 B.C. right up until today.