Exactly, OP. It's just for the evening, you want it to be something you'll wear again - & you don't even like the people much!!!
The first four dresses that you are considering may not be my thing - but with the right accessories are easily dressed up to make them more evening-appropriate. The nicest by far though, is the bow-back viscose-linen mix Zola dress in green. (If you haven't already bought the other green satin one, I wouldn't. Satin is not for sunny summer days in Italy.)
However, if the Zola bow-back dress arrives & you change your mind, of the first four that you posted I would go with either the pink & red patterned one, or the pink polka-dot one (although I seem to be the only one who doesn't prefer it! The colour is a bit too sickly sugared almond for me ... Irrelevant if you love it though!). The first orange-yellow one seems to be satin? Are it & the fourth dress quite as bright egg-yolk as they look? I'm not keen on either - but that's largely because I don't like that tangerine shade.
I do find it hard to believe that the orange-yellow shade would suit "English rose colouring" - it seems very overpowering. But then I'm not sure that's what you actually are, if you have dark brown hair & green eyes? Do you tan easily? (To me, English Rose-type colouring is usually associated with pale creamy skin, flushed pinky-peach cheeks, light-coloured eyes & blonde/light brown hair.)
If you really have no idea what suits you, I'd go with a PP's suggestion of a John Lewis personal shopping appointment - & putting some thought into what colours you like & suit best. If you really don't know, then maybe getting a colour analysis might be useful too.