Kosher catering, Non-kosher program

Hi,

Despite the prohibitions against placing a stumbling block before the blind and aiding wrongdoing, as well as the requirement to help others avoid sinning, one may provide catering services for an event at which transgressions will take place, where there are other catering options besides his own.

(Rav Moshe Feinstein, Igrot Moshe Yoreh Deah 1:72)

Have a great day,
Mordechai