Hey Franky!
I also have got a database error since the update (1.6.8.):
WordPress-Database-Error: [Unknown column 'wpacdm_eme_events.event_id' in 'where clause']
SELECT * FROM wpacdm_eme_events e LEFT JOIN wpacdm_eme_locations l ON e.location_id=l.location_id
WHERE event_status IN (1,2) AND (event_rsvp=0 OR (event_rsvp=1 AND event_seats > (SELECT COALESCE(SUM(booking_seats),0) AS booked_seats FROM wpacdm_eme_bookings WHERE wpacdm_eme_bookings.event_id = wpacdm_eme_events.event_id))) AND (event_start_date >= '2016-02-04' OR (event_end_date >= '2016-02-04' AND event_end_date != '0000-00-00' AND event_end_date IS NOT NULL)) AND FIND_IN_SET(4,event_category_ids)
ORDER BY event_start_date ASC, event_start_time ASC, event_name ASC
LIMIT 11
The single event-pages work just fine when I open them via backend. The problem comes up when I try to list events. Seems to be a problem with the Event-ID-Column. I checked it in the db itself and it looks normal. Any ideas?