All are qualified to read the Megillah except one who is deaf, an imbecile, or a minor. R’ Yehudah declares a minor qualified.  We may not read the Megillah, nor circumcise, nor perform ritual immersion, nor sprinkle [purification water] —- similarly, a woman who counts a day corresponding to a day may not immerse herself until the sun has risen. However, [if] any of them did so after the [first] ray of dawn appeared, the act is valid.

The entire day is valid for reading the Megillah; reciting the Hallel; blowing the shofar; taking the lulav; [reciting] the Musaf prayer; [offering] the musaf-sacrifices; the confession [recited with the offering] of the bulls; the confession [recited with] the tithe; the confession of Yom Kippur; leaning the hands [on the head of a sacrificial animal]; slaughtering [of sacrifices]; waving [of sacrifices]; bringing near [the vessel with the meal-offering to the altar]; taking a handful [of the meal-offering] and burning it; nipping [the neck of the bird-offerings]; receiving [the blood of sacrifices]; sprinkling [the blood of sacrifices]; causing the sotah to drink; decapitating the heifer; and the cleansing of the metzora.