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_224837_4 ( date_successor_seated VARCHAR, reason_for_change VARCHAR )

### Question ###
Name the date successor seated for delegate seat established

### Accurate SQL ###

SELECT date_successor_seated FROM table_224837_4 WHERE reason_for_change = "Delegate seat established"