emergency decisions!!!! please help!

if anyone could make this decision for me, i'd be really very grateful! i'm going to a birthday bus run on saturday night, and i can't decide what to wear. the theme is 'dress to impress', so i can't wear anything i would normally wear on a night out, in case its too casual. so i've narrowed it down to three (black) dresses and i just can't choose, they're all so out of my comfort zone!!! i was going to wear a lovely gold dress i have from river island but i think dark is a better option, it's very likely drink will be spilt and i'd rather it not show up!! any help with this would be soooo very appreciated!

this dress is from topshop. i like it but i liked it better when i wore it back in march, when i could be a bit more wintery with it and wear it with opaque tights and shoeboots. just not sure that it works as a more summery dress! the belt is from faith @ debenhams and the shoes are from dolcis.
this one is from new look, i got it in november for a 21st birthday party, and have only worn it once since then! i like how it looks on, but i seem to have lost some weight and it no longer fits properly! it was always a bit baggy; i have to wear it with clear bra straps to hold it up! but now it gapes around the back, not a good look! but it's an ok length and it looks better without tights than the topshop one!

this last one is from oasis. it's still got the tags on, i haven't worn it outside of my room yet! i like the puffiness of the skirt, but i think it might be almost too dressy! ahhh!!!

if anyone at all can help with this, please do! this is getting dire now!!! thank you! :) x