Sforno on Exodus 12:26/ספורנו על שמות י״ב:כ״ו

1מה העבודה הזאת לכם?, which is performed on a day that does not even bear the appellation מקרא קודש, “holy convocation? All the other mandatory communal offerings are offered on days designated as festivals. Not only that, but the whole day is available for slaughtering those offerings whereas the offering known as Passover is only accepted from noon until sunset [roughly, in fact even less time than that. Ed.] Besides, why does not a single communal offering serve as this memorial of the Exodus? Other public offerings serve each for the whole community.