@dotdashdashdash
LOL cheeky feckers! 
Puts me in mind of a couple - who used to live 5 doors from us - some years ago, who invited me and DH and DD - and about a dozen other neighbours, and a further 20 or so colleagues and extended family to her firework party/BBQ. She told everyone 'come along and just bring a few bits to eat, and drink, and some fireworks.'
When people enquired further, it turned out that she wanted people to bring fireworks, wine, beer, pop, crisps, nuts, sausage rolls, cupcakes, pringles, hot dog buns, hot dog sausages, and all manner of things.
So .... she was having the 'firework party' and only providing the music, paper plates, and little plastic cups. It cost me and DH around £45 with the fireworks, booze, and snacks we took!
God knows how much the other 30 or so people spent. But she had a big firework party/BBQ, and had all the guests provide the food, drink AND the bloody fireworks. Amazingly she then went on to post 50 or so pics on facebook, and totally took full credit for it all!
So much for being invited to a party... it cost us a load of £££. Especially as she only bloody asked us - and half the other people 1-2 days before. So the only damn fireworks left in the shops, were the more expensive ones.