We do not currently have this problem but we are moving soon and will be experiencing it

First idea off hand would be clear bins that are labeled and if you are fortunate enough to have a closet near the space you will use, you could use one of those rolling clear drawer units. They are very economical. We currently are sharing our space with another church. We use clear bins, they use blue. It may take you coordinating some clearing or reorganizing of space but it would be worth the effort. Nothing worse than knowing you have something but having no idea where it is! Blessings on your organization adventure.