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 table_11900773_6 (first_day_cover_cancellation VARCHAR, date_of_issue VARCHAR, theme VARCHAR)

### Question ###
Where is the first day cover cancellation for the 3 April 2008 IIHF World Championships, Quebec City stamp?

### Accurate SQL ###

SELECT first_day_cover_cancellation FROM table_11900773_6 WHERE date_of_issue = "3 April 2008" AND theme = "IIHF World Championships, Quebec City"