Praise be to Allah.
It is the teaching of the Messenger of Allaah (peace and blessings of Allaah be upon him) that there is no call before the prayer on Eid al-Fitr or Eid al-Adha in order to tell the worshippers to attend the prayer-place, or to tell them of the ruling on the prayer. So that should not be done, whether via microphone or anything else, because the time of the prayer is known, praise be to Allaah. Allaah says (interpretation of the meaning):
“Indeed in the Messenger of Allaah (Muhammad) you have a good example to follow for him who hopes for (the Meeting with) Allaah and the Last Day, and remembers Allaah much”
So the people in authority, rulers and scholars, should tell the people about the ruling on this prayer before the day of Eid, and explain to them how it is to be done and what they should do during the prayer, and before and after, so that they will be prepared to attend the prayer place on time, and perform the prayer as prescribed in sharee’ah.
And Allaah is the Source of strength.