Work these in order: warm first, local second, cold last
Your own email history. Anyone who ever asked about hosting an event. Warmest list you'll ever have. Covered above. Pro tip: Event Captain plugs into your email, surfaces every past booking inquiry, and organizes them by company, event type, timing, and status, so you know who to contact each quarter without digging through three years of email yourself.
Conference and expo exhibitor lists. Companies sending teams to town need dinners and happy hours. Find upcoming shows on your convention centre's event calendar or your city's visitors bureau site, then pull the exhibitor list from the conference website.
Chamber of commerce directories. Local, sorted by industry, and the members are already active in the community.
The local business journal's book of lists. Ranked lists of the largest employers by sector. Usually a small fee, worth it.
LinkedIn company search by headcount and location. Filter to 50 to 500 employees within your metro. This is the main source for building the 100-company list.
Google Maps and local search. Zoom into the business districts in your area and see which companies have offices nearby. It surfaces local companies that don't show up on LinkedIn or exhibitor lists.
Blue-collar local companies. For auto body shops, dealerships, and similar owner-operated businesses, emailing the general info@ address often goes straight to the owner.
Find the booker and their email
For each company, find one person with one of these titles: office manager, HR lead, or executive assistant.
These are the people who actually book corporate events. The CEO doesn't. The marketing director usually doesn't either.
Finding the name is the easy part. LinkedIn people search with the company name and one of those titles gets you there in under a minute.
The email is where it gets fun. A lead database beats guessing. Here's the honest breakdown (prices in USD):
The free tiers are trials, not engines. Apollo's free plan covers about 100 leads a month. Seamless.AI gives you 50 credits total, one time, then you're done.
For this to actually work, you need volume. Think 2,400 to 4,000 leads a month. At that scale you're on a paid plan, no way around it.
Doing it free? Check the company website for any published email. It gives you the pattern (first.last@, firstinitiallast@, first@). Apply that pattern to your contact's name. If the pattern doesn't verify, try the next most common format. If nothing verifies after two tries, skip the company. One verified contact beats ten guesses, and emailing info@ is usually the same as not emailing. The exception is small owner-operated businesses, where info@ often reaches the owner directly.
Whichever route you take, verify every email before you send. Around 30% of pulled leads are inactive on average: people on leave, people who changed jobs, profiles that were never updated. Send to those and you'll wreck your sending reputation before your first reply.
These all do the job:
Run your list through one of them and drop everything that doesn't come back valid.
This step is the honest reason software and services exist. If you're spending most of your outreach hours hunting emails, that's your signal to price out software or a done-for-you platform in the cost section below.