While it is not a universal tradition, it is quite common in some cultures to celebrate weddings with a toast of sparkling wine or Champagne. Cava is a type of sparkling wine that is produced in the Catalonia region of Spain, and it is often used in wedding celebrations in that area.
The tradition of toasting with sparkling wine or Champagne dates back to ancient times when people believed that the bubbles in the wine had magical powers to ward off evil spirits. Today, it is simply a way to celebrate a special occasion, such as a wedding, with friends and family.
So while getting married does not necessarily guarantee you a glass of Cava or any other type of sparkling wine, it is a lovely tradition that many couples choose to incorporate into their wedding celebrations.