Going to Chicago!

Hello! me (17F) and my boyfriend (18M) are planning on going to Chicago June 28th to July 3rd for a concert, to see his aunt, and go on a trip together for the first time! We plan on leaving home the 28th of June (about a 3 hour drive) and we have the concert the 29th of June! the rest of the time (4 days) to do what we want. we will have a budget of about $600 (after tickets for concert) or more depending on if we can save more to go out and do things. is that enough money or do we need more? also I'm looking for ideas on what to do based on that budget (will post again if budget changes)! this will be my first trip without my parents so I'm very excited! we both like anime, food, shopping, Legos, greek mythology, theater, games, architecture, and already plan on going to a planetarium since he knows I love astrology and I've never been to one!