Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE city (City_ID VARCHAR, Population INTEGER)
TABLE: CREATE TABLE farm_competition (Theme VARCHAR, Host_city_ID VARCHAR)

### Question ###
Please show the themes of competitions with host cities having populations larger than 1000.

### Accurate SQL ###

SELECT T2.Theme FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID WHERE T1.Population > 1000