Why was it called an EV summit and not a union summit then? Only UAW companies were allowed at an "EV" summit despite barely having EVs for sale because it was

Why was it called an EV summit and not a union summit then? Only UAW companies were allowed at an "EV" summit despite barely having EVs for sale because it was a quid pro quo for the UAW endorsing Biden early in his campaign. It was a government event and not to include an American company that pioneered EVs made it a very political move.