Cool niche! I have to be honest that the first reaction I had to your first name was that it is a dating service of some type. It's the word "affair" that I'm honing in on. When choosing a name, you have to think of all kinds of things - such as how will a name cause your business to be perceived regarding what it actually does vs. what someone may at first glance think it does.
I do love the tagline though! But are you consulting for Event Planners, or are you actually going to take on some of their administrative responsibilities? Consultancy means that you are offering someone your expert advice. Here's a wiki definition, to help you with this. > http://en.wikipedia.org/wiki/Consultant
To be a consultant you would go in and assess and advise them on what they can do better with their business. Consultants don't do hands on type of work.
I know that I'm not coming back with things you probably want to hear....sorry. :-(
May I suggest looking here > 20 considerations when naming your business
This was posted elsewhere in this forum, and I believe it has helped many when naming their business. I especially like #3 on the list because had I thought of that early on I wouldn't currently be on my 4th business name, which is now just my name, because I do want to expand.
Don't just take my feedback though. I'm just letting you know my first reaction. Interested to see how it plays out for you.