For instance, we have some vegetarian Buddhists, and lactovarian Hindus in the mix, so that means you absolutely must have something for them, and that requires no cute little ham chunks in the salads (for example).
Quite regularly some Shi'ites show up (friends of the kids from down the street), so we have turkeybased salami to put on the home-made cheese pizza, and everyone likes that.
We've had large events here where there weren't more than 4 people who belonged to even the same world-religion level "brand", like Christian, Buddhist, Mormon, Hindu, Shinto, Jewish, Shi'ite, Sunni, and so forth, to say nothing of denominations within a broad class.
So, to answer the question about prayer with the heathen, even those who believe they possess the revealed Word of God, or at least a serious guidepost to that Word if God were to reveal Himself ~ what everybody does is get the prayers out of the way before dining.
It's also a very good idea in a remarkably mixed crowd to begin serving "snacks" of appropriate kosher/halal/vegetarian mix BEFORE any main servings, and this tends to screw everybody up on when and where to pray, so usually nothing anyone does focuses attention on them and their own traditions (or religious obligations).
When serving mondu filled with kimchi it's a very good practice to inform everyone that it's strictly vegetarian. Otherwise, virtually everyone assumes the kimchi is filled with roast pork and garlic. Jains don't eat garlic.
you have JAINS where you're living? Where are you from? Gujarati India? I thought most Jains were from there (well, wikipedia'd it)