If the others are wearing suits and the ladies are in gowns, the Argyll jacket with a long tie is the appropriate choice. I wouldn't wear a black bow tie without the jacket, but I wouldn't wear either to this particular event.

If you don't have an Argyll, I'm afraid you may be a bit underdressed in your shirt sleeves and might be better off in a suit until you acquire the proper kit.

A tweed Argyll would certainly suffice for this event, as would a black barathea silver buttoned dress Argyll with a long tie. You may be able to hire a dress Argyll for the evening.

Although I don't recommend going jacket-less for an event where the others are wearing suits, if you do choose to wear the kilt and don't want to spring for a jacket, perhaps you have a waistcoat/vest with a cloth back rather than a satin/polyester one. A five button waistcoat and long tie is the best choice for this level of formality.

Good luck, Dave! Hope the snow isn't too severe today!