If you have a completed manuscript, a pitch conference will suit your needs perfectly. These conferences not only offer you a chance to pitch your work to an agent or editor, they include workshops that teach you how to pitch. There is no better way to meet an agent, so if you can go to one of these conferences, I highly recommend it.
You can find a comprehensive list of writing conferences HERE as well as links to help you find conferences in your area.
Upcoming pitch conference
(Even if you don't plan on going, read the website. It will give you a good idea of what a pitch conference is like.)
New York Pitch Conference
When: Dec 8 - 11, 2016