Over four thousand members of the public – music fans of all ages, families, creative and cultural professionals, photographers, videographers and the downright curious – flooded Symphony Hall on Easter Saturday for Curious Sounds in Curious Spaces, an open day presented in association with Fierce Festival as part of our 21st Anniversary celebrations.

Thanks to a small army of dedicated and inventive artists, the whole building was transformed into an incredible maze of the weird and wonderful, featuring mysterious vintage whirling machines and spooky rattling locker doors in the band rooms, giant helium filled balloons fitted with harmonicas being released in the auditorium, playable staircases and foyers stuffed with activities and workshops.

Felix’s Machine’s had the boys hypnotised – had to keep going back Michele Latham, via Facebook

A Feral Choir made up of local residents, members of the city’s business community, children’s centre staff, university students and THSH staff finally had their 15 minutes of fame performing as on stage to a sizeable audience after a series of workshops with concept creator Phil Minton.

Feral Choir were incredible, discordant and beautiful at same time Luke Emery, via Twitter

And a mere 12 hours before the first visitors stepped into the building, we were enjoying a six hour opera concert – Wagner’s epic work Parsifal - performed by Valery Gergiev and the Soloists, Chorus and Orchestra of the Mariinsky Theatre, St Petersburg.

At the other end, two hours after the last Curious Sounds installations had been cleared from Symphony Hall, an estimated 2000 people were in attendance for a sellout show by TV and stand-up comedy star Sarah Millican.

Read the full Curious Sounds in Curious Spaces Storify

We’d like to say a big thanks to Fierce Festival and their volunteers, project manager Amy Rozel Martin, all the artists, Team THSH and of course each and every visitor who made the day such an enjoyable experience.

An extract from THSH’s newsletter.