How many guests can attend? May 04, 2023 02:50 Updated A minimum booking of 15 guests is required. The size of group may be limited by party venue. Our Restaurant Managers can assist in this regard. Related articles Are there any age restrictions for guests? Can adults have parties at McDonald’s® too? How long will the party last? How much does it cost to have a party at McDonald’s®? What does the standard McDonald’s® party package include? Can I bring my own cake instead and place it in your storage facility?