Oak Brook Hotel Event Venue With Ballroom Space for Weddings and Meetings

For events in Oak Brook, Chicago Marriott Oak Brook provides a large hotel event program with Grand Ballroom and Oak Brook Ballroom. With room for approximately 1,250 at the upper end, the venue has the scale for major social gatherings, large company functions, and high-attendance programs. For gatherings in Oak Brook, with food service already connected to the venue, dinners and receptions can remain cohesive from arrival through the meal. The hotel setting supports both the event itself and overnight guests, which can simplify larger gatherings that combine meetings, meals, and accommodations. Built-in or supported AV expands the room beyond dining, making it useful for presentations, speeches, videos, meetings, and other program-driven events. A hotel venue also gives business and social groups the convenience of guest rooms close to the function space, which is particularly useful for evening events and multi-day programs.

The property works across business and social formats, from meetings and training sessions to wedding weekends, banquets, reunions, and company celebrations. The property can also support smaller breakout conversations alongside a larger main gathering when multiple rooms are part of the event offering. Food service, lobby areas, guest rooms, and function space together give attendees several natural places to gather across the course of a longer event. For evening celebrations, the ability to stay on the property can be particularly useful for guests who have traveled in or prefer not to leave immediately after dinner and drinks. Meeting rooms can carry presentations and working sessions during the day, while banquet areas and restaurant service support dinners, receptions, and social time afterward. Chicago Marriott Oak Brook keeps event space, hospitality service, and overnight accommodations connected for groups that need more than a single room.