A previous entry has spawned a discussion in comments that I want to call out, because two days is forever in blog time and I have some readers who might be interested.
The magid (in many ways the main part of the Pesach haggadah) begins with the following declaration: "This is the bread of affliction that our ancestors ate in the land of Egypt. Whoever is hungry -- let him come and eat. Whoever is needy -- let him come and celebrate Pesach!" (This is known as "ha lachma anya", for the opening words -- which are in Aramaic, the then-common tongue, so that they would be understood.)
I, and most liberal Jews I know, interpret this pretty broadly; we would invite a Jew or a gentile who expressed interest. Some traditional readings say this applies to a Jew only, pointing out that "come and celebrate Pesach" was originally about joining in the korban (animal sacrifice), which is only applicable to Jews. But (as someone pointed out else-thread), you must include your servants under most circumstances, even if they're non-Jews, so clearly there is some room for interpretation here.
I have a lot of readers who are learned in such matters, so I pose the question to you: whom do you feel obligated to include per "ha lachma anya", and who else would you include anyway? What are the issues?
Personally, I would include anyone who asked out of apparent sincerity, Jewish or not. I don't really care if the person is a seeker exploring Judaism or just curious; if he wants to learn enough to show up, he's welcome. The only bar would be to someone who has made it clear that his goal is to harrass, or who somehow poses a serious threat to me or my other guests. (That's hypothetical, but I include it for the sake of completeness.)
I am also mindful that I was that outsider once, that then-gentile who crashed a seder at the last minute because I realized it mattered. So there's some amount of "pay it forward" in my reaction, but it's not just that. I want to be the kind of person who says "of course; we'll just add a chair to the table", and the kind of person who is approachable in matters of religion.
There is discussion in comments on Dreamwidth, also archived.