Does hosting guests at home with meat and alcohol (because they are fond of it) amount to aiding the guests break their Sila? I'm a strict vegetarian and non-alcoholic. But all my friends are non-vegetarians and alcohol consumers. So, when I host a party at my place, it becomes obligatory of me to host them with alcohol and non-vegetarian food (bought from a restaurant). Although, I have done this in the past, I have started to think if it is really right of me to do so, since I may be aiding them in breaking their Sila. But, coming from a culture where guests are to be treated as Gods, I also wonder if it will be rude of me to call them home and not serve to their liking. 

So, should I, at the cost of hosting a boring(for them) party, appearing rude and risk losing their company, help them keep their Sila intact (if at all it does) at least for an evening? Or should I not bother about trying to combine preaching and hosting and keep my ethics limited to me?

P.S. I'm convinced that consumption of meat and alcohol is breaking of Sila in the true spirit of the Buddha's teachings, irrespective of how certain sects or traditions of Buddhism may justify alcohol and meat consumption.
"So, when I host a party at my place, it becomes obligatory of me to host them with alcohol and non-vegetarian food (bought from a restaurant). "

I don't see how it is obligatory. You could serve delicious vegetarian food and non-alcoholic drinks. If you take your Buddhist precepts you are not supposed break them yourself or encourage others to break them. I think your instincts on this are correct. 

Would it be so boring? Have you spoken to your friends about this? Why not raise the subject and see what they say?