
Retro Rock at the Museum first began as a one-off event in 2018 when the museum held an exhibit about 1960s music.
South Canterbury Museum director Philip Howe said he could not believe how far the event had come since then.
"It has been a wonderful thing to see it keep growing and that people want to see it continue.
"For the first one, we hoped to get a couple of hundred people come along but were amazed when over 1000 appeared.
"It really speaks to the interest and need for events downtown."

It was great to give the next generation of musicians a space to play, Mr Howe said.
"Outside of the Smokefree Rockquest there are not too many places for young people to play.
"It’s great to be able to give young local bands a chance to play in a large, friendly and safe space."
He believed the event attracted a lot of interest because of the juxtaposition of rock music and a museum.
Also announced for the event are local bands Quattro, who will be making their retro rock debut, and VHS, who made an appearance at last year’s event.

Spot prizes will be awarded for the best dressed.
There will also be events held on the night such as a local history and music quiz and the chance to win lucky prizes.
Food vendors will be present and the museum will be open for a quieter time-out space for people to enjoy.
Retro Rock will be held on Saturday from 7pm, outside the South Canterbury Museum in Perth St.