Large space to hold training

I’m enquiring on behalf of a children’s circus charity based in the uk that runs circus activities and performances for children both in the UK and abroad in crisis zones and difficult living conditions. I am looking for a large space to hold training for our new volunteers from 18th – 21st February 9-5pm. It will be 20 people running around making a lot of noise. Location ideal would be in London zones 1-4, preferably south east. We don’t need any equipment but need a large space suitable for 20-30 people to run around in. We also need to be able to make a lot of noise!