How often does the UEFA Champions League occur?
UEFA European Championship
The UEFA European Championship (known informally as the Euros) is the primary association football competition contested by the senior men's national teams of the members of the Union of European Football Associations (UEFA), determining the continental champion of Europe. Held every four years since 1960, in the even-numbered year between World Cup tournaments, it was originally called the UEFA European Nations' Cup, changing to the current name in 1968. Starting with the 1996 tournament, specific championships are often referred to in the form "UEFA Euro [year]"; this format has since been retroactively applied to earlier tournaments.
Republic of Ireland at the UEFA European Championship
The UEFA European Football Championship is the main football competition of the men's national football teams governed by UEFA (the Union of European Football Associations). Held every four years since 1960, in the even-numbered year between World Cup tournaments, it was originally called the UEFA European Nations Cup, changing to the current name in 1968. Starting with the 1996 tournament, specific championships are often referred to in the form "Euro 2008" or whichever year is appropriate.
Prior to entering the tournament all teams other than the host nations (which qualify automatically) compete in a qualifying process.