Give the years and official names of the cities of each competition.
SELECT T2.Year ,  T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID  =  T2.Host_city_ID
years of each competition refers to T2.Year; official names of the cities refers to T1.Official_Name; competition is hosted in cities refers to JOIN on T1.City_ID = T2.Host_city_ID;