Is there a way to get out of this without being rude?

Just go, make an appearance and leave when you start to feel uncomfortable (:

go fuck the attractive girl!!!

Either go and focus on other people rather than yourself or don't go if you don't feel you can cope.

Maybe you could just say you're not comfortable in groups of people and invite them to your place some other time soon?

It sounds as if you want to get to know them and vice versa, but maybe in your own home you'd feel more comfortable getting to know them.

Are you more nervous because of the attractiveness of the female neighbour and if so, what's that about?

I dont know how to get out of it other than lying about having something important to do that day,
I may be able to give advice on social awkwardness.
I can be very socially awkward. Sometimes I annoy people and sometimes I make people uncomfortable. It is probably to my advantage that I never recognize this when I am doing it, but I am often later told what I did.
It is inevitable that all people will do these things to some extent.
It is inevitable that some people will not give others a chance.
What I have noticed is more people seem to like me than not, and if they dont I dont know about it.
Always be yourself, because the people who will matter the most will like that and may never get to know you if you do not be yourself.
People you have to impress will not be as signifant in your life.

Most people dont think too much about others anyway. If you do something weird they will usually forget the next day.
Just show up and be awkward as fuck and you should be fine. You may be suprised to find out most people dont care if someone is awkward. They are usually focused on themselves.

Cut a circular hole in the top of a pumpkin, pour some brown sugar in it, make a small drippy hole in the bottom of the pumpkin and hang it in a tree outside. Let the stuff drip into a container.
For future use.
This will solve your lack of alcohol problem.

I guess you could look if they have a dog? Awkward people love petting other peoples' dogs when they feel awkward.

Try thinking of interesting or funny stories to tell them about the history of your area?

Take your guitar along, find where the fire is being made, sit there and play. There is always another dude who would wanna play with and always another girl who wants to learn. Always.

I blamed it on family-related and canceled something just recently to avoid going home to a woman who wanted to have me over with her four kids and some relatives AND they barely spoke my language.

It felt awful canceling something I had agreed to do but I should learn to not say yes to things I find uncomfortable.

Just head straight for the free alcohol and loosen up

You could always go to the party naked with a paper bag over your face screaming like a lunatic >:)

But seriously though, maybe you can talk them about the party and tell them that you're a little uncomfortable being surrounded by people you don't know. I'm the same way /: I'd at least like to get aquatinted with a few people before a big event so I'd be comfortable with getting to know everyone else.

Sorry if that's not great advice /:

You can do a few things:
1)Go and just try and have a good time and if things go wrong tomorrow just say you had to much to drink
2) just say that you don't like being around a bunch of people you don't know and you can get to know them another time
3) say that family stuff came up and they should understand
4)go for a few minutes say hi to them and talk you can leave when you want and as long as you say that you might leave a bit early befor the party even starts it won't be that weird.

It seems to me it would make a lot more sense to delay this shindig until the weekend, when others are free.
That is unless this "insanely attractive" woman has the hots for you and they are setting you up for a wild threesome!
Go with the flow, who knows?

Can you think of any acquaintance/friend that would be willing/free to join you to the party?