As regards the issue we quote a fatwa by the late sheikh al-Islam Ibn Taymiyyah (may Allah confer mercy upon him), who said,
“Bringing people together to offer them food on the two `Eids and on the days of al-tashreeq (the three days following ‘Eid al-Adha) is Sunnah, and it is one of the symbols of Islam which the Messenger of Allah (blessings and peace be upon him) prescribed for the Muslims.
Helping the poor by giving them food during the month of Ramadan is also one of the Sunnahs of Islam. The Prophet (blessings and peace be upon him) said: “Whoever gives food to a fasting person with which to break his fast will have a reward like his.”
Moreover, giving to poor reciters that which will help them recite the Qur’an is a righteous deed at all times, and the one who helps them to do that will have a share with them in the reward.”
Excerpted with slight modifications from islamqa.com
however, we maintain that offering food to people, reciting a story of a Muslim figures or any other righteous deed is a good act in itself and should be done all the time. Yet, specifying a day in which you do special good act which was not narrated from the Prophet (peace be upon him), is an act of bid`ah and disapproved. There are certain deeds recommended by the Prophet on certain days such as fasting on Monday and Thursday, reciting surah Al-Kahf on Friday, etc. and we should observe them. But, if such specification is not narrated from the Prophet or his companions, it should not be observed, and if a person does it, he is committing bid`ah and is sinful.
Hence, the ruling is unless a deed is reported from the Prophet on special day, it is reprehensible to specialize a day with such a good deed.
We have to stick to what has been reported from the Prophet and his companions because theirs is the straight path.
However, your role then is to advise your family not to transcend the sunnah of the Prophet in such days and limit to what is reported from the Prophet (peace and blessings be upon him) because the way of the Prophet and his companions is the only to Paradise.
May Allah grant us all success!