My event company targets corporate retreats
I am assuming that you are in the corporate retreat management business?
If yes, I would start within your own geography since you'll probably have to do face-to-face selling and onsite delivery. I would target companies with 500+ employees. Within those companies, try to get to HR and any internal event planners. Companies with a large, active sales force is also a good target. Even is business is down, sales meetings are the last thing to go.
Set-up a call and I can get into more specifics once I learn more about what your company offers.