Is it forbidden to establish a business that supplies food and beverages for wedding parties, birthday parties, and Christian celebrations?

It is forbidden to establish a project for organizing the aforementioned parties because they are either inherently forbidden, such as Christian holidays, or they involve forbidden acts, such as the reprehensible acts in their wedding parties. Assisting in sin is forbidden, as Allah Almighty says: (And cooperate in righteousness and piety, but do not cooperate in sin and aggression). A Muslim must change the reprehensible, not contribute to it.