SELECT *
FROM london_stages
WHERE MATCH('(@(authnameclean,perftitleclean,commentcclean,commentpclean) "Chambers"/1) | (@(roleclean,performerclean) "Chambers")')
GROUP BY eventid
ORDER BY weight() desc, eventdate asc
OPTION field_weights=(perftitleclean=100, commentpclean=75, commentcclean=75, roleclean=100, performerclean=100, authnameclean=100), ranker=sph04