I think that there is nothing wrong with it, but it is better not to do this, because the Sahaabah (may Allaah be pleased with them) did not do such a thing. If people can be encouraged to observe naafilah fasts through words, then this is sufficient and there is no need to do so through deeds.
Organizing communal iftaars to encourage people to fast
Question: 1948
What do you think of encouraging ordinary people to observe naafil fasts by organizing communal iftaars?
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah.
Source:
Liqa’ al-Baab al-Maftooh by Ibn ‘Uthaymeen, 247)
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