Ice Cream Social RSVP Website: Scoop Counts, a Dairy Line, and a Freezer Batch
An ice cream social RSVP has to lock a serving before the freezer is packed, because a maybe does not hold a scoop.

An ice cream social breaks when the freezer holds eight quarts and fourteen people expect a full bowl, or when someone who cannot eat dairy is handed a scoop from the only tub you packed. Servings, the dairy line, and the amount you freeze are set before the first lid comes off. The store does not hold an extra tub because a friend decided to come after you bought the order. A maybe does not hold a scoop.
You can create an ice cream social RSVP that fills the servings you can actually scoop, records who cannot eat dairy or a listed topping, and stops when that batch is full.
Ask what this freezer can serve
Decide the batch before you send the link. Write down how many people get a serving, how many scoops that serving is, which flavors you will have, and whether cones, cups, and toppings are included. Those numbers are your cap. Do not guess from the size of the cooler. Ask the shop how many scoops they count in the container you are buying, then buy to the yes list.
A serving is one person's ice cream, not one household and not one toppings bar. Ask whether a small child is a half serving you will still count, and whether a guest who will not eat ice cream can attend without taking a scoop. Pick one rule and write it on the page. If the limit is the number of bowls and not the number of chairs, say that a non-eater does not reduce the scoop count but may still need a seat.
Ask whether you are scooping or a shop is, and the last time you can change the order. If the shop will not take a tub back, print that rule on the page. Write the flavors and the toppings you are sure of, including nuts and gluten cones.
Set a capacity limit on servings, not on everyone who was invited. When the last scoop in the batch is taken, the form should say the social is full. A friend who might come still needs a bowl from a tub you have not bought. If the freezer is already packed, they are not in this batch.
Dairy and toppings are the menu
Most of the table is dairy unless you packed a separate tub. Collect dietary limits with severity before you confirm a serving. You need a line you can shop to, not a paragraph about favorite flavors.
Can eat this batch means dairy is fine, including the cone and the toppings you already listed
No dairy means they need a non-dairy tub you are actually buying, or they should not take a scoop
One topping is a problem means they can take a plain scoop only if that item stays in its own bowl and is not sprinkled over the tub
Buy the non-dairy tub only for the people who marked it, and cap that tub at those servings. Do not promise a vegan option and then show up with one pint for five people. Nuts stay in a separate bowl or they are not on the table. A cone that contains gluten is a named item, not a surprise in the stack. A mild preference for chocolate is not a second flavor you have to stock.
Households, not a single bowl
Ice cream socials are full of families. Use household replies so one adult can answer for the people in that home, with a serving and a dairy line for each name. A single yes that means "the kids are coming too" will empty the freezer before the last family is served. The scoop count follows the names, not the number of cars in the lot.
Say whether people should arrive in a set window so you are not scooping for an hour while the first bowls melt. Put the start time and the time you stop scooping on the page. Ice cream that has sat in a warm room is done. Do not promise a fresh bowl for someone who arrives after the tubs are empty or soft.
The moment the order is placed
The meeting point is the park shelter, the church hall, or the backyard, with the address and where to walk in. Put the host's phone on the page. A shop social still has a fixed serving count. The case behind the counter is not your backup supply unless you paid for it.
If you allow a guest, that person needs their own serving decision and their own dairy answer. Track them as a separate yes. One form that hides an extra eater will blow the scoop count. Say that on the page. Name the cup, the cone, and the topping rules next to the question so a household does not assume the toppings bar is unlimited.
Tie your RSVP deadline to the shop order, the day you buy or they pack the tubs. After that, a late yes is a call about a cancellation, not a promise of another scoop. If you want names ready when someone drops, keep them as standbys and tell them they do not have a serving until you write back. A maybe does not hold a scoop.
Export the list the day you order: attending or not, servings by name, dairy or non-dairy, topping limits, and phone. An ice cream social RSVP is finished when every scoop has a person who can eat it, the non-dairy tub matches its own short list, and you are not opening a freezer that was packed for people who never answered.