** Music event organizer's shares up 4.8 pct at $6.80
** Company's Q2 adjusted revenue rises about 18 pct to $82.1 million
** Revenue helped by 70 pct rise in attendance at music festivals such as "Tomorrowland" in Belgium and "Electric Zoo Mexico City"
** Says to host 50 events in second half of the year, compared with 19 in first half ended June 30
** Benefit of the events to reflect in Q3 and Q4 operating results
** Stock had declined about 46 pct this year to Wednesday's close