Sentence:  Each local union has a separate number; New York was the first so they are Local One. Chicago is Local Two. A <WSD>"yellow card</WSD>"<!--sic italics--> (they have been printed on yellow cardstock since time began) is sent out telling how many hands will be required in in each department for the "load-in", "load-out", and for the run of the show. 
Meaning of the word marked with <WSD> tags:  A card sent out by a travelling dance or theatre company to request temporary personnel from a local labor union.