Table: steeler_1978_season
Columns: week
date
kickoff_et
tv
opponent
result
record
game_site

Question: Which team did they play at Rich Stadium?
SQL: SELECT "opponent" FROM steeler_1978_season WHERE "game_site" = 'Rich Stadium'

Question: What date did they play in Cleveland Municipal Stadium?
SQL: SELECT "date" FROM steeler_1978_season WHERE "game_site" = 'Cleveland Municipal Stadium'