We ran one sponsorship-packet prompt in Claude and checked the result on a phone. Here is the prompt, a table of what the AI used, made up or left blank on the page, and the one-word edit that marks a tier SOLD OUT.
This is for whoever runs the sponsorship side of a charity 5K, a school gala or a club tournament, and already uses ChatGPT or Claude for half their emails. Asking it for the packet is the obvious move.
The words are the easy part. The trouble starts three weeks in. The same packet went to forty local businesses, Gold had two spots and both are taken, and thirty-eight inboxes still hold a copy that says Gold is open.
So we tried it. One prompt, one run in Claude, one phone-sized screen. Below is what came back, line by line.
In our run, yes, first time. Claude returned a single 10 KB HTML page that read cleanly on a phone, with a tier table, spots left, key dates and an Email me button.
It also filled the page with numbers we never gave it. We had asked for fake numbers, so that part was expected. What wasn't: the tier prices came with a "these are placeholders" note, but last year's fundraising total and the size of the audience were written as plain fact.
Marking a tier SOLD OUT took a one-word edit, and it worked.
So the job splits into three: give the AI your real numbers and read every one it writes, mark sold-out tiers by changing that one word, and send the packet as a single link you can update instead of an attachment.
This is the prompt we ran on 19 October 2026, word for word. It uses a placeholder event; swap in yours.
I'm the volunteer organiser of a community 5K charity run. Make our sponsorship packet as ONE self-contained HTML file: all CSS inline, no external images, fonts or scripts, readable on a phone.
Include: the event in two lines (date, place, expected runners, cause); why sponsor us; sponsorship tiers in a clear table (Gold, Silver, Bronze, In-kind) with price, number of spots, what each gets; a visible "Spots left" for each tier and a way to mark a tier SOLD OUT that I can change by editing one word; key dates (deadline for logos on shirts); how to commit (email me, and a link to a form I'll add later); contact. Put a "Last updated" line at the top.
Placeholder event: "Riverside 5K for the Food Bank". Fake numbers I'll replace.
How we tested it:
Two lines in the prompt do most of the work. "A way to mark a tier SOLD OUT that I can change by editing one word" is what makes the packet maintainable; without it you'd be asking the AI to redesign the table every time something sells. "Fake numbers I'll replace" kept our test generic. Don't copy that one. Put your real numbers there.
Every item on the page we got, where it came from, and what you'd do with it. "Ours" means it came from the prompt. "Made up" means the AI wrote it. "Placeholder" means it left something visibly unfinished.
| On the page | What the AI did | What you do |
|---|---|---|
| Event name, "Riverside 5K for the Food Bank" | Ours | Your event name |
| Date, park, "about 500 runners expected", the food bank's full name | Made up | Your details |
| "Last year's run raised $12,000, enough for about 36,000 meals" | Made up, written as fact, no placeholder note | Your real figure, or delete the line |
| "500 runners, 300+ spectators, and a local email list of 2,000 people" | Made up, written as fact, no placeholder note | Your real figures, or delete |
| "Sponsorship covers event costs, so more of every entry fee goes to the food bank" | Made up, a claim about where the money goes | Keep only if that's how your budget works |
| Tier names: Gold, Silver, Bronze, In-kind | Ours | Your tiers |
| Prices ($2,000 / $1,000 / $500 / goods worth $250+), spots, spots left, benefits | Made up, with a note under the table: "All amounts are placeholders" | Replace with your tiers |
| Key dates: shirt-logo deadline (in red), payment due, race day | Made up | Your dates |
| "Last updated" line at the top | Added as asked, set to the day we ran it | Set it to today each time you edit |
| "Email me" button | Built as asked, addressed to organiser@example.com with the subject filled in | Your address (see below) |
| "Sponsorship form (coming soon)" button | Placeholder, the link goes nowhere | Your form link (see below) |
| Contact block: a made-up name and a 555 phone number | Made up | Your details |
| The SOLD OUT switch | Built as asked, with a how-to note hidden inside the file | See the next section |
The two rows to stop on are the fundraising total and the audience. Those are the sentences a sponsor lifts into their own approval email. If one survives into the version you send, it becomes your organisation's track record, and it's wrong.
On a phone the tier table turned into one card per tier, with price, spots, spots left and benefits stacked underneath. The note explaining the sold-out switch sits above the tier rows in the file itself, so you'd only see it in a text editor, which is where you'll need it.
Open the file in any plain-text editor and search for the tier's row. In our page, Gold looked like this:
<tr class="gold open">
Change open to soldout:
<tr class="gold soldout">
Here is what we saw after saving and reopening it at phone size:
What the switch doesn't do:
If you'd rather not touch the file, paste it back into the chat and ask the AI to mark Gold as sold out. Then check that the one word changed and nothing else did. AI edits to a whole file sometimes tidy up things you didn't ask about.
example.com. In ours it appeared three times: the Email me button, the contact link and the contact text.Collect the real numbers before you open the chat, because the AI fills every gap you leave: the event in two lines, last year's results if they're real (or "this is our first year"), expected attendance and the size of any list you'll thank sponsors on, each tier's name, price, spots and benefits, the logo deadline, payment date and event date, and who to contact.
Then add one line to the prompt: "Use only the numbers I give you. Where a section needs a number I didn't give, write [NEEDED: what it is] instead." We didn't rerun our test with that line, so read the result anyway.
Set up the sign-up form first, too. Our page's form button was a placeholder (its link was just href="#") because the prompt said a form would come later. Make one in Google Forms or whatever you already use, paste its address in place of the #, and delete "(coming soon)" from the button. If you want commitments to land in a spreadsheet you own without a form service in between, a form on the page can post straight into a Google Sheet; sending an HTML form to your own Google Sheet walks through it. Either way, don't ask the AI for a form that "submits" without saying where to: a form on a static page needs somewhere to send its answers.
Not as an attachment. An attachment gives every company its own copy, and none of them will ever see your SOLD OUT edit.
Send one link instead, to a host that lets you replace the file behind the link without changing the address. On miinideck, you upload the .html file and get a link to send. When Gold sells out, you make the one-word edit, update the date, and replace the file on that same link. Everyone who opens the link from then on sees SOLD OUT, including the thirty-eight companies you emailed weeks ago. Replacing a file needs a free account. What happens when the file changes after you've sent the link covers the general problem in more detail.
A replaced file can't reach copies people downloaded or forwarded as attachments, and a tab someone left open may show the old version until they reload. That's why the "Last updated" line sits at the top: a reader holding an old copy can see its date and open the link to check.
Drop in the HTML file and get a link. With a free account you can replace the file later and keep the same link.
A few specifics worth knowing:
A Stripe Payment Link takes the money, but the file is your job. Stripe's two after-payment options, three ways to hand over a guide or template without a backend, which of them can be forwarded (all of them), and when a platform like Gumroad, Lemon Squeezy or Payhip is the better tool.
An annual report gets read in March by donors on their phones, printed for the board, and reopened in September by a funder. How a PDF attachment, a page on your website and a single replaceable link each hold up over that year, and how to fix a typo after it's out.
An attachment can't be updated. A link can, if the host lets you replace the file behind it. What Google Drive's Manage versions does, what Drive, Dropbox, OneDrive and Acrobat don't say about the link, when you shouldn't swap a file quietly, and what the reader sees after you do.
miinideck turns a single HTML file into an unguessable link with optional password and expiry. Default-private, never indexed.