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_204_536 ( id number, "event" text, "bowling center" text, "city" text, "dates" text, "winner" text )

### Question ###
which event occurred first the st. paul open or the charlotte open ?

### Accurate SQL ###

SELECT "event" FROM table_204_536 WHERE "event" IN ('st. paul open', 'charlotte open') ORDER BY id LIMIT 1