There are 3 parking lots around the venue, as well as street parking! Uber and Lyft run often downtown. If you are staying at the Sheraton Crown Center it is a 3 minute drive or a 15 minute walk. There is also a free streetcar that runs from 7 am- 10 pm, so could be taken to the ceremony. But, you would need to plan ahead, it has a stop near the hotel and a few blocks away from the venue (it will show up on google maps).