Zip Line Party RSVP Website: Harness Slots, Weight Limits, and a Locked Departure
A zip line party RSVP has to lock a harness slot and a weight inside the line's limit before the group leaves the platform, because a maybe does not hold a harness.

A zip line party breaks when the operator has six harnesses and eight people arrive, or when someone is outside the line's weight limit and you learn that at the platform. Harnesses are sized and inspected before anyone clips in. The cable does not add a seat because a friend decided to come after the van left. A maybe does not hold a harness.
You can create a zip line party RSVP that fills the harness slots the course allows, records a weight that fits the line, and stops when that departure is full.
Ask the operator what this booking holds
Call before you send the link. Write down the minimum and maximum riders for the course you booked, the weight minimum and maximum, any height rule, how long the tour runs, and what time the group must be at the briefing. Those numbers are your cap. Do not guess from a photo of the platform.
Ask whether this is a private booking or a public tour other groups can join. If it is private, you are paying for the guides and the time slot, not for empty harnesses, and the operator still will not put a seventh person on a six-person line. If it is public, say so on the page so people know strangers may be clipped into the same group. Ask whether you can add a second departure if the list runs long, what that costs, and the last time you can add it. If you cannot add a departure, do not invite as if you can.
Set a capacity limit on people who will ride, not on everyone who was invited. When the last harness is taken, the form should say the tour is full. A friend who might come still needs a harness, a helmet, and a guide's check. If there is no harness, they are not on the line.
Weight, height, and a contact that is not in a locker
The operator's limits are not a suggestion. Ask each rider for the weight and height the operator uses, and put those ranges on the page so people can see the rule before they say yes. Someone outside the range is a no for the ride, not a person you hope the guide will wave through at the stairs.
Ask whether the operator needs a signed waiver before arrival or at check-in, and whether a minor needs a parent or guardian on site. If a parent must sign and is not riding, that parent does not take a harness, but they may still need a seat in the shuttle or a spot in the lot. Say which, so you do not fill the van with spectators and leave a rider behind.
Collect an emergency contact for each rider. The guide needs a name and a number that is not the rider's own phone, which will be in a locker or a zip pocket they cannot reach. A missing contact is a reason to hold that person off the line until you have one, not a detail you collect after the first cable.
Shoes, stairs, and what stays on the ground
Ask the operator what people must wear: closed-toe shoes, nothing loose around the neck, hair tied back, and whether glasses need a strap. Put that list on the page. Ask whether lockers are included and whether phones ride along or stay behind. Do not promise a photo package the operator did not include in your booking.
If someone cannot climb the stairs to a platform or walk the trail between lines, ask the operator whether that course has another path before you confirm them. Put the answer on the page. A course with ladders does not become accessible because the invitation sounded easy.
Wind, lightning, and a locked departure
Wind, lightning, and ice close lines. Ask the operator who decides, by what time, and how they tell you. Then add a weather contingency: a later departure you already hold, a rain date, or a cancel that follows the operator's refund rule. Name who sends the message and by what clock time. "We'll see how it looks" is not a plan a guide can staff.
The meeting point is the course office, with the lot name and whether you walk or ride a shuttle to the first platform. Put the check-in time on the page. Late riders do not get a second briefing after the group has left the ground.
If several people are coming from one household, ask them to answer for each person who needs a harness, not one yes for the whole car. One form that hides two extra riders will blow the weight check and the harness count. Say that on the page.
Tie your RSVP deadline to the operator's change deadline. After that, a late yes is a call about a cancellation, not a promise of another harness. If you want names ready when someone drops, keep them as standbys and tell them they do not have a slot until you write back. A maybe does not hold a harness.
Export the list the day you lock: attending or not, weight and height against the operator's rule, waiver status, emergency contact, phone, and any access limit the operator agreed to. A zip line party RSVP is finished when every harness has a rider inside the line's limits, the guide has a contact that is not a locker phone, and the departure time is locked.