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_name_66 ( week INTEGER, attendance VARCHAR )

### Question ###
What is the sum of Week when there were 67,968 people in attendance?

### Accurate SQL ###

SELECT SUM(week) FROM table_name_66 WHERE attendance = "67,968"