Luckily, we've got plenty of options for you
For example, Teachable a startup that helps people create online courses posted a picture of their team out to lunch and mentioned they were hiring: Looks like most of the team is in casual/smart casual clothes, which gives you a great reference point for what to wear if you were interviewing with them
And this is a great piece for a day graduation ceremony, and an evening out partying
It's less strict than black tie but still leans towards formal
It might ask for black-tie optional, for instance, or black-tie preferred. If you see black-tie optional on the invite, black-tie wedding guest attire is not mandatory, and its perfectly fine to come in a more relaxed but still formal outfit
On the other hand, if the outfit has been bought with an upcoming wedding in mind, it is better to opt for heeled sandals or pumps