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_38942 ( "Week" real, "Date" text, "Opponent" text, "Result" text, "Attendance" real )

### Question ###
What is the average week that there was a game with less than 18,517 fans attending and occurred on November 21, 1954?

### Accurate SQL ###

SELECT AVG("Week") FROM table_38942 WHERE "Attendance" < '18,517' AND "Date" = 'november 21, 1954'