Sentence:  For this scene, a large number of supers are engaged, and in order to further swell the crowd, practically all the <WSD>available</WSD> stage hands have to ‘walk on' dressed in various coloured dominoes, and all wearing masks. 
Meaning of the word marked with <WSD> tags:  Such as one may avail oneself of; capable of being used for the accomplishment of a purpose.