Evening Casual Attire Casual/Formal Business Attire?

Casual/Formal business attire? - evening casual attire

I have a conference and there is no dress code. I have never seen one, but every night is something different .... The business casual during the day / evening cocktail party dress casual. / .... Business casual
...... The business casual during the day / night .... Business Casual Wear


What should I wear .... I have no idea ... All is in thought, probably not in jeans ... but after that I missed ... Pictures would be great!