when we have parties or people round, I love doing Kir. Cava (or champagne!) fizz with a small bit of Creme de Cassis (blackcurrant type thing costing about £5 from drinks section of supermarket) in bottom of glass, topped up with fizz. It always looks nice, it is festive (lovely in summer too!) and always makes people feel a bit sohisticated which soon goes out the window after the 3rd or 4th glass.....!
Co-op are doing a brilliant offer on a particular Cava at the moment... normally £8.99 a bottle, they have it for £3.99 with 10% discount for 6 bottles or 20% discount for 12. It is nicer than champagne I think....
Also fab music helps....