How do you find your professionals?
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Obviously your best bet is to ask a trusted source or friend that has had a similar vendor and can give you credible feedback and advice. But what if that isn't an option, maybe you prefer to do your own research?
Without drawing this out or getting off topic the short answer is the internet. Most likely a google search, right? What next? Do you pick the first one? The Top Rated? Most reviewed? The choice is yours, but think about a few of these questions when considering.
Is the company with biggest advertising budget the best?
Do they provide the latest and greatest services using new technologies?
Are they new to the industry?
Recently serving your area?
Offering new services?
Special Promotions?
There are plenty of reasons why businesses pay to be the top listed on search engines, it's up to you to ask the right questions to find the best fit for your needs. So happy hunting and good luck planning your next event!