Can one eat the Purim meal earlier in the day, If they will be doing Mivtzoim later?
Usually, the custom is to eat this meal after Minchah in the late afternoon, since we are busy with reading the Megillah, giving out matonos l’evyonim and mishloach manos in the morning. The meal should begin during daytime and preferably continue into the night of Shushan Purim.
It is permitted to hold his Purim Seudah in the morning instead of the afternoon if preferred. The main thing is to hold the majority of the meal during daylight hours. Someone who is running late should at least make certain to sit down to a meal and eat an amount equivalent to a kebeitzah , or at a minimum, a kezayis , before shekiah (sunset).