Table: roughriders_2008
Columns: week
date
opponent
score
result
attendance
record

Question: What was the date of the game with an attendance of 20,874 fans?
SQL: SELECT "date" FROM roughriders_2008 WHERE "attendance" = '20,874'

Question: What was the record the the match against vs. calgary stampeders before week 15?
SQL: SELECT "record" FROM roughriders_2008 WHERE "opponent" = 'vs. calgary stampeders' AND "week" < 15