Does social convention have any place in politics or ethics?

Here's the original question: How would you describe the relationship between social contract and social convention? Objectivism seems to oppose the social contract theory, what about social convention? Especially in instances where such conventions conflict with objectivist ethics. Should an individual who follows Objectivist standards respond to a conflicting social norm, however trivial it may be? Or is it sometimes advisable to “go along to get along”?