Yes! Both the ceremony and reception are within the Morton Arboretum. The ceremony is taking place in the Grand Garden, near the Visitor's Center. The cocktail hour & reception will be held at the Thornhill Education Center. You'll need to drive or take the tram (Acorn Express) between these locations.
The most efficient option is to park at Thornhill (P21) and take the Acorn Express to the Grand Garden for the ceremony (departures at 4:15, 4:35pm). The Acorn Express will bring you back up to Thornhill for the reception after the ceremony (departures at 5:50, 6:20pm). Alternatively, you can park at the Visitor's Center (P1) and drive yourself up to Thornhill (P21) after the ceremony.
The ceremony will be held in the Grand Garden which is located near the Visitor's Center (VC).
The cocktail hour and reception will be at the Thornhill Education Center. This is located on the west side of the arboretum, a 7 minute drive from Grand Garden (ceremony). You will follow signs from the main entrance.
Pick Ups (before ceremony) @ Thornhill at 4:15pm & 4:35pm. Pick ups (after ceremony) @ Grand Garden/Visitor's Center at 5:50pm & 6:20pm. The Acorn Express holds 48 people.
Have your driver drop you at the main entrance: Visitor's Center by 4:45pm. The Arboretum entrance gatekeepers will instruct you to the ceremony location.
Departures from the Hyatt @ 3:45, 4:00pm, 4:15pm to the Arboretum (Visitor's Center/Grand Garden) Returns to the Hyatt @ 10pm, 11pm, 12am to hotel