Invite students and guests to each write short briefs about the other, detailing why they are each special. Offer examples of potential things to include, such as activities they share, the way they make one another feel, and so on. Once the project is complete, invite the group to share what they have written with the others. This provides writing and public-speaking experience, as well as boosts the self esteem of students and acknowledges the commitment of their guests.
Incorporate a reading activity by asking students and guests to select text to share. Suggest they take turns reading paragraphs or pages of a book, or prompt them to read chorally, or in unison. When that concludes, encourage them to create crafts that illustrate favorite parts of those stories. Not only does this activity serve as a bonding experience, but it also promotes a love of reading and fosters comprehension and fluency.
Through this activity, guests figuratively walk down memory lane and children gain appreciation for changes that occur over time. Create two sets of written questions -- one each for students and guests -- that pertain to fourth grade. They can center on lessons learned, describing a typical day and entertainment pursuits. Once the questions are answered, encourage everyone to share answers. Compare and contrast fourth grade from the era of guests to the present day.
Cooking encourages an excellent bonding experience. Provide ingredients for a simple recipe and establish an area set up to allow that. If there is no access to a stove or oven, choose a recipe not geared to cooking, just to preparation -- like a fruit or tossed salad. Lead the cooking endeavor and review mathematical terms like fractions, conversions, and so on. When the activity is completed, feast together.