My fiance and I will be getting married in Costa Rica in January 2013. We live here, and it will be a small wedding (around 30 people) with his family, close friends, my mom, and maybe 2 of my best friends. We´ll be moving to New York (where I´m from) a few weeks after the wedding and plan on having a reception for our loved ones in NY, probably in April. This will be a little larger than the Costa Rican affair, but not by much (approximately 50 people).
My question is about plus-ones. None of the guests will be put in the position of not knowing anyone, since it´ll be family and good friends. Of course I´ll invite my best friend´s boyfriend of (on and off again) 5 years, since she´s my best friend, they have a legit history, and I´ve known him for years and have spent some time with him. What my other friends, though? Do they get plus-ones? Two of my friends will have been with their boyfriends for 1 year at that point (assuming they don´t break up before then!), but I´ve never met or spoken to the guys. In all fairness, that´s probably my fault for being the one who went on vacation to Costa Rica, fell in love with the country and decided to stay... then fell in love with a man and decided to marry him! But still, I don´t know the guys. I don´t want to be rude, but I also don´t want to invite people I don´t know, especially to a relatively intimate reception. So... What´s the protocol here? I realize I do´n´t have to worry about this at this EXACT moment, but I´d rather start figuring it out earlier rather than later.
Thanks in advance for your thoughts!

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