I have no problem at all going out to events by myself. If it's a social thing, then the nine-degrees of separation rule tends to work and I'll find I know somebody that I'll meet. As it is, it's always good to practice your social niceties and keep your conversational skills sharp - I tend to think that the ability to meet a stranger, take an interest in what they're saying and make their acquaintance is one that's fading from society.