Similar shows exist like Lotta på Liseberg, Sommarkrysset... but Allsång på Skansen is the biggest one and most well known
"Allsång på Skansen (Sing-along at Skansen) is a Swedish show held at Skansen, Stockholm, every summer on Tuesdays between 8pm and 9pm.
The audience is supposed to sing-along with musical guests to well-known Swedish songs...
Today about 10,000–25,500 people come to each performance."
"Since 3 August 1979 the show has been broadcast by Sveriges Television."
Source
About once a week for 5-8 weeks every summer famous Swedish artists go live and sing music they made and once done they choose famous songs found in a sing-along book all the audience has
Most songs get subtitled so people at home watching on TV can also sing along
Allsång på Skansen intro song
"Allsång på Skansen (Sing-along at Skansen) is a Swedish show held at Skansen, Stockholm, every summer on Tuesdays between 8pm and 9pm.
The audience is supposed to sing-along with musical guests to well-known Swedish songs...
Today about 10,000–25,500 people come to each performance."
"Since 3 August 1979 the show has been broadcast by Sveriges Television."
Source
About once a week for 5-8 weeks every summer famous Swedish artists go live and sing music they made and once done they choose famous songs found in a sing-along book all the audience has
Most songs get subtitled so people at home watching on TV can also sing along
Allsång på Skansen intro song
Other examples: