When leaders gather this week in Los Angeles at the Summit of the Americas, the focus is likely to veer from common policy changes — migration, climate change and galloping inflation — and instead shift to something Hollywood thrives on: the drama of the red carpet. With Mexican President Andres Manuel Lopez Obrador topping a list of leaders threatening to stay home to protest the US’ exclusion of authoritarian leaders from Cuba, Nicaragua and Venezuela, experts say the event could turn into a embarrassment for US President Joe Biden. Even some progressive Democrats have criticized the a...