Cocktail or semi-formal, if that's helpful. More importantly- we want you to really be feelin' yourself on the dance floor. Delight yourself and others and wear something fun! The temperature during the day will likely be in the high 70s, dropping to the 50s at night. The events will be outside, but you are welcome to go in the house to cool off or warm up.
That depends on what you want to do, but it's definitely not necessary. The wedding hotel is 10 min from both the airport and the wedding venue- so Lyft and Uber are easy options. The hotel also has shuttles that can provide transport. Fortunately, Molly only knows east Omaha, so all recommendations on the Things To Do page are within 10-15 minute drives.