Trade show organisers almost never sell attendee lists. The people who do sell them are usually selling scraped registration data, an aged list from a previous edition, or addresses constructed from names and a company domain. What you can legitimately get before a fair is the exhibitor directory, the published agenda, and the people those two name — which, for selling, is most of what you wanted anyway.
Why the organiser will not sell you the list
It is their most valuable asset and selling it once destroys it. An organiser's business is that attendees come back, and attendees stop coming back when registering for a fair produces four months of cold email. So the attendee list is the thing they protect hardest, and the sponsorship packages that touch it — a badge scan, a delegate app, a mailer the organiser sends on your behalf — are structured precisely so the list never leaves their hands.
There is a second reason, and it is why the first one has teeth. For a European fair the addresses are personal data of identifiable people who gave them to an organiser for one purpose. Whether you have a lawful basis to email them afterwards is a real question with a real answer, and it is a question for your own counsel rather than for a vendor's landing page. Ask anybody selling you an EU attendee list where consent came from and what it covered. The answer is the whole of the risk.
What the vendors are actually selling
Not all of it is bad, but it is worth knowing which of the four you are being offered, because the price is similar and the value is not.
- Last year's list
- Real data, wrong year. Roughly a fifth to a third of any professional list has changed job in twelve months, and at a fair the churn is worse because attendance itself is a decision that gets re-made annually. Ask which edition the list is from. If the answer is vague, that is the answer.
- The exhibitor list, sold as an attendee list
- Exhibitors are attendees, so this is not quite a lie. It is also public — it is on the fair's own website — and it is the one thing on this page you can get for free with an afternoon and a browser.
- Registrant data from somewhere it should not have come from
- Scraped from a badge system, a networking app, or an organiser's own portal. This is the category worth being most careful about, because it is the one where the seller's story about provenance is doing all the work.
- Constructed addresses
- A name, a company, a guessed pattern. This is the one that is hardest to detect and easiest to sell, and the next section is about how to catch it.
How to tell a read address from a generated one
Ask the vendor one question: for this specific row, what page was the address read on? A real address has an answer — a team page, a conference programme, a press release, a published paper. A generated one has a pattern instead, and the pattern is the tell.
Take twenty rows from any sample file and look at the shape of the addresses. If nineteen of them are the first initial and the surname at the company domain, you are not looking at twenty findings. You are looking at one rule applied twenty times, and the several of those that happen to be correct do not make the others real. Nobody sending to them can tell the difference, which is exactly why the file is worth so much less than it costs.
What is genuinely obtainable before a fair
- 1The exhibitor directory. Almost every fair publishes one, and it is the highest-value public document about the event: who has taken a stand, usually with a hall and stand number, and often a line about what they do.
- 2The agenda. Speakers, panellists, workshop leads and their job titles, published by name because the organiser is using them to sell tickets. These are senior people who have told the world they will be in a specific room at a specific hour.
- 3The exhibitors' own pages. A company that has taken a stand frequently announces it, and the announcement names who is going. Team pages, press releases and LinkedIn posts do the rest.
- 4The event's own networking app, once you have registered. This is the legitimate route to actual attendees, and it exists because the organiser controls it.
- 5Your own list, filtered. The single most underrated source: which of your existing pipeline is going, which you find out by asking them.
None of that is an attendee list. All of it, together, is a better morning than an attendee list, because every row on it comes with a reason to walk up.
What Pengo does, and what it refuses to do
Pengo reads the first three of those five for you. It takes a fair, reads the exhibitor directory end to end, works out what each company sells from the company's own pages, scores every stand against a description of your buyer, and names the people it can find on the agenda and on the exhibitors' own sites. Every name carries the page it was read on.
It will not sell you an attendee list, and it will not construct an address. A person is kept with an email only when the research states it read one on a published page. That rule is enforced in the parse rather than promised in a paragraph: a row whose address was not read is dropped before it ever reaches a screen, and the number of dropped rows is reported rather than quietly rounded away.
Two more refusals worth stating, because they are the ones that cost us rows. A person with no source page is dropped, however plausible the name. And a LinkedIn profile is attached only when the handle begins with the person's full name and a profile actually turned up at it — a wrong profile link is worse than no link, because somebody opens it and addresses a stranger.
The full list of what the research refuses to invent is on what Pengo knows, and what it will not guess.
Questions
Can you buy a trade show attendee list?
Organisers almost never sell one, because the list is the asset their business depends on and reselling it drives attendees away. Vendors who offer one are usually selling data from a previous edition, the public exhibitor list, scraped registration data, or addresses constructed from names and company domains.
Is it legal to buy a trade show attendee list?
It depends on where the attendees are and where the data came from. For European fairs the addresses are personal data given to an organiser for one purpose, so the lawful basis for emailing them is a real question. Ask any seller where consent came from and what it covered, and put the answer to your own counsel.
How do I get the exhibitor list for a trade show?
It is almost always published on the fair's own website, free. The work is not getting it — it is that a list of two hundred company names tells you nothing about which of them is worth your morning.
How can I tell if an attendee list has fake email addresses?
Take twenty rows from the sample and look at the pattern. If nearly all of them are the first initial plus surname at the company domain, that is one rule applied twenty times rather than twenty findings. Then ask the vendor which page a specific address was read on.
What can I actually find out about attendees before a trade show?
The exhibitor directory, the published agenda with speakers and their titles, whatever the exhibitors say on their own sites about who they are sending, the event's own networking app once you register, and which of your existing pipeline is going.
Does Pengo sell attendee lists?
No. Pengo reads the exhibitor directory, the agenda and the exhibitors' own pages, and returns named people with the page each name was read on. It keeps an email address only where the research states it read one, and never constructs one.
What does it cost to research one trade fair?
Every pass is quoted before you press it and charged at the quoted price. A fair is priced by how big it is, in one press: a 200-stand fair read in full — the exhibitor list, a profile for every company, and a score on every stand — is 2,750 credits, about $11. If a fair turns out bigger than we priced it, we read it all anyway. Plans start at $39 a month.
What happens if the research finds nothing?
The pass settles as failed and the credits are released in full. A pass that established nothing has nothing to sell you.