Použijte DAYOFWEEK() :
Něco jako
SELECT * FROM events WHERE DAYOFWEEK(start_time) = 7
OR DAYOFWEEK(start_time) = 1
...
Použijte DAYOFWEEK() :
Něco jako
SELECT * FROM events WHERE DAYOFWEEK(start_time) = 7
OR DAYOFWEEK(start_time) = 1
...