Look out for unused shops or businesses to let in your area. They will have 'To Let' signs outside that show the name of whoever is managing them. Contact the letting agent via email, or call or drop into their office. If a space pays business rates and is empty they may benefit from you being in there for a short time as it might mean they don't have to pay rates for that period or longer. They usually give aprox. 6 weeks and arrange for a contract with a 'peppercorn rent' which just means an insignificant amount of money (like a penny). This could be a good way to try out projects, host things or show work.