Can we accept the invitation of Non-Muslims to participate in Onam celeberations?

Keralaties are celebrating Onam -the national festival of Kerala- now a days .Our Hindu neighbours invite us for lunch. It is also called Ona sadya. Can we accept their invitation? Some Maulavis say that their food is forbidden to us . what Islam says about this?

You have to certainly accept their invitation. It is a good opportunity to interact with them to convey to them the message of Islam and distribute the translation of the Quran and other Islamic literature in the gathering. I don't think there is any wrong in accepting this kind of invitation. Even if there is something that is objectionable according to tradition religion, you have to accept it as part of talif-e-qalb.