If there is a significant time gap between your wedding ceremony at noon and the reception starting at 7pm, you can consider providing your guests with a list of optional activities or suggestions to keep them entertained and engaged during the interim period. Here are a few ideas:

1. Explore Chicago: Provide a list of nearby attractions, landmarks, or neighborhoods that your guests can explore. Chicago offers numerous tourist spots, such as Millennium Park, Navy Pier, the Art Institute of Chicago, and the Magnificent Mile.

2. Arrange a guided tour: Organize a guided tour of Chicago to give your guests an opportunity to explore the city's history, architecture, or food scene. There are various tour options available, such as architectural boat tours, food tours, or neighborhood walking tours.

3. Provide a list of recommended restaurants or cafes: Share a list of nearby restaurants or cafes where guests can enjoy a leisurely lunch or afternoon snack. Consider suggesting places that offer diverse cuisines or are known for their Chicago-style dishes.

4. Plan a group activity: Arrange a group activity or excursion for your guests to participate in. This could include a visit to a local museum, a boat cruise on Lake Michigan, a shopping trip to a nearby mall, or even a group picnic in one of Chicago's beautiful parks.

5. Offer transportation options: If you have the means, consider providing transportation for your guests to visit nearby attractions or engage in the suggested activities. This can make it easier for them to navigate the city and ensure everyone arrives at the reception on time.

6. Host a pre-reception gathering: If you have the space, you could organize a pre-reception gathering at a nearby venue, such as a lounge or bar. This gives guests an opportunity to relax, socialize, and grab a few drinks before the reception begins.

7. Relaxation and downtime: Recognize that some guests may prefer to have some downtime or rest during the gap. Ensure that your reception venue provides a comfortable waiting area or offer suggestions for nearby parks or gardens where guests can relax and enjoy some tranquility.

Remember to communicate these options and suggestions to your guests in advance, either through your wedding website, invitation inserts, or by providing printed material at the ceremony. This way, guests can plan their day accordingly and make the most of their time in Chicago before joining you for the reception.