SELECT category, date, client
FROM sbs_events
INNER JOIN sbs_userEvents ON sbs_events.id = sbs_userEvents.event_id
WHERE category <> 'bar' AND answer = 2 AND user_id = 1

UNION ALL

SELECT category, date, MIN(client) AS client
FROM sbs_events
INNER JOIN sbs_userEvents ON sbs_events.id = sbs_userEvents.event_id
WHERE category = 'bar' AND answer = 2 AND user_id = 1
GROUP BY category, date