While deciding promptly makes sense if you find the right gown, a trunk show is also simply a wonderful way to see a full collection in person and learn what suits you, even if your final decision comes later
If youre a bit more flexible at the office, you can get away with wearing a blazer and chinos for example, as well as a tie, but when you go to the smart casual party, I suggest taking off the tie, add a bold pocket square, maybe a boutonniere, have some bolder socks and shoes and brown tones or more colors such as dark red, dark green, or navy, and it just creates a more fun outfit that is not as boring or stuffy formal as you would usually know from an office environment
Occasions:Evening events, weddings, mother of the bride
Set both screws aside somewhere you wont lose them
In practice it doesnt matter what matters is the result