Say your company sponsors the annual Christmas party (planned and paid for by the company) at your house each year . Even though it's a company function it's at your house because everyone likes it there and you don't mind.
Wouldn't you be the person responsible to make sure that there's nothing illegal going on?
I say YES.
If you have a party at your house, regardless of who sponsors it, you need to make sure no laws are being violated. Sure you can't control the behavior of everyone but you also can't knowingly allow people to break the law. Take underage drinking for example. So you didn't pay for the party...so you didn't plan it...doesn't mean you're not in any way responsible for anything that goes on there. If there's underage drinking going on, you have a responsibility to stop it, even if you aren't the individual(s) paying for the function.
What do you think?
**Editing in...I am posting this question after RQ's response to be more clear :) The reason I mention this issue is because I and those I know (of all ages) support it too. There are however, individuals who have in the past, at one time or another allowed such behavior to take place--at their house! Because I've had people at my house before and have never had a problem because you see, I feel that it is my responsibility to be sure everything is "kosher" I decided to find out how the masses out there feel too. Seems we're all in agreement--and frankly I think it's just plain common sense.