What event prompted the formation of the first continental congress?

It was the Boston Tea Party.

Boston Tea Party it was an incident occurred in 1773 when 342 tea boxes belonging to the East India Company were thrown from ships in Boston by Americans disguised as Mohawk Indians. They were protesting against a tea tax and the East India Company monopoly. It was an important protest movement by the American colonists against British rule.

whitch constitution would be inadequate as a basis for government today?

the answer would be a) it only allowed catholics to be in government.