SELECT eventtbl.*, performertbl.firstname, weekdaytbl.weekday, performer2.firstname AS perf2firstname
FROM eventtbl INNER JOIN performertbl ON eventtbl.perfID = performertbl.perfID LEFT OUTER JOIN performertbl AS performer2 ON eventtbl.perf2ID = performer2.perfID INNER JOIN weekdaytbl ON eventtbl.weekdayID = weekdaytbl.weekdayID
ORDER BY eventtbl.`date` LIMIT 50