Short answer: no—however many people you want to be a part of your elopement, there are ways to make it happen. That being said, many locations on public lands have group size restrictions. The smaller you keep your guest list, the more locations you'll have to choose from, and especially if you want a free and secluded location. Once your group gets bigger than 10-15 people, you'll most likely need to reserve a ceremony site (usually in the $50-300 range), and if you'll have more than 25-30 people, you'll likely need to book a venue (starting around $1500 for short weekday elopements, but often in the $5,000-10,000 range). Most of my couples who invite guests will split the day into two parts: a ceremony with their guests in an easy access location, and a hike or other adventure for just them (and me!) to a more remote location.