We recommend the app SpotHero for discounted parking but there is also a garage at the McDonald's Headquarters building a couple blocks away.
Anywhere you would like! River North is 1.5 miles east of the venue (easily accessible via Uber or Lyft) if you would like a more city atmosphere. The venue is located in Fulton Market/West Loop where I have given some recommendations for local hotels. We also have a block of rooms reserved at the Chicago Marriott Downtown Magnificent Mile.
Morgan's on Fulton is an indoor/outdoor rooftop venue. In the event that it rains (crossing my fingers it will be warm and sunny) we will have a tent with full coverage on the patio. Cocktail hour will be inside. We recommend bringing a light jacket in case it cools down throughout the night, we will be on the rooftop dancing until 12am!