The Sunnah is to keep on fasting and you attend the invitation and pray for them without breaking your fast. But if you want to eat and break your fast, this is permissible.

It is sunnah to take fasting on monday and thursday, if they have some invitation,do they reject because of fasting,or attend as fasting or not to take fasting on that days and eat food they serve as a part of happiness?which is better?

Fasting |