Monaco crams the Casino de Monte-Carlo, the Prince's Palace changing of the guard, and the Oceanographic Museum founded by Albert I into 2 square kilometres, with Formula 1 closing the streets each May.
Monaco Grand Prix the third weekend of May closes the streets to F1, and the harbour fills with superyachts. Cannes Film Festival days earlier.
Riviera peak with the Monte-Carlo Sporting Club concerts, Jazz Festival in late November aside, and the harbour at maximum yacht density.
Yacht Show in late September brings the world's largest superyachts to Port Hercule, and the Monte-Carlo Rolex Masters tennis event rounds out April calendar.
Mild Mediterranean winter with daytime 15°C, Monte-Carlo Christmas market in Port Hercule, and the casino atmospheric in winter quiet between rallies.