Is it permissible for us to eat food brought by non-Muslims during their religious celebrations?

Fatwa, posted 4.22.2010, from Iraq, in:
Religious Authority: 
Ali al-Sistanti
Website URL: 
http://www.sistani.org/
Fatwa Question or Essay Title: 
Is it permissible for us to eat food brought by non-Muslims during their religious celebrations?
Websites and Institutions: 
The Official Website of Grand Ayatollah Al Uzma Seyyid Ali al-Sistani

Yes, it is permissible unless the meat is not halal.

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