For the Executives The dress code suggestion at many daytime semi-formal events (particularly work lunches and conferences), this dress code calls for a suit and tie for the guys and a tailored dress or a pantsuit for women. The idea is to wear something business appropriate, that also feels dressed up. http://stylecaster.com/dress-code/
Cocktail attire technically means a suit for men, and a cocktail dress for women, which usually means a short dress (preferably not career wear) and depending how formal you think the event is, you can glam it up with accessories