 
 <prompt> Which Song Festival adult participants suppose join? Given di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: The tradition of Estonian Song Festivals (Laulupidu) start for 1869 when Estonian national dey wake up. Today, e be one of the biggest choral events wey amateurs dey do for the world. For 2004, about 100,000 people join for the Song Festival. Since 1928, the Tallinn Song Festival Grounds (Lauluväljak) dey host the event every five years for July. The last festival happen for July 2014. Also, Youth Song Festivals dey happen every four or five years, the last one na for 2011, and the next one go happen for 2017. 