April:

Jumping Chantilly ( at the racetrack), a national competition that brings together hundreds of horses, free access.
Easter in the Garden (Potager des Princes), an Easter egg hunt in the park embellished by the spring.

May:

Museum Night, a special opportunity to enjoy the museums at night.

June:

Jockey Club, the race that seeks the best colt of the year
Open Days, a chance to meet the horse world as well as professionals and learn the secrets of the Horse Capital.
Prix de Diane, the most elegant race of the year, concerts, events and hat competitions.
Charity Cup, Cup of Polo's the most generous one. Fierce competition and a concert for charity.

July:

Global Champions Tour, a stage of the World Cup Jumping on the racetrack. Free access

August:

Concours d'Elegance of Arabian horses, dozens of horses parade to represent Europe in the World Championship.
CastleTriatlón, a triathlon at the castle and into the forest for a unique experience in Chantilly.
Run or Dye, a colorful and fun race for all the family at the racetrack

September:

Art and elegance, a competition that brings together the most beautiful cars in the world. 600 cars and concept car at the castle.
Open de France Polo Cup in France, the best teams in France participate for a coveted and prestigious title.
European Heritage Days, the whole country puts its best to present treasures and wonders, heritage, in exhibitions, workshops and excursions.

October:

Fear in the park Parc Asterix make you scream with fear and trembling in a lively amusement park for Halloween.
Science Festival in the Pavillon de Manse, a unique opportunity to discover new techniques and old machinery.