If you're expecting Jain guests who have a strict no to onion and garlic then you need to serve them with special food.Veg caterers in Ahmedabad often have special packages for Jain food. Its your wedding and you would not want any of your guests to return with an empty stomach. So it it better to have a talk with your caterer before you hire them about your requirement and also brief them about your demand for special food. Often caterers agree to prepare the special food but that to for a price. So if your planning to have special on request made food then be better prepared to shell out a few extra bucks