Actors Showcases are a great way to be seen by industry professionals.
Actors showcases require you to first sign up for the showcase at a cost, then you have a few sessions with the showcase director to choose a scene and rehearse. They are a great way for you to be seen by agents and casting directors and if you are without an agent it can be a good opportunity to bag yourself an agent.
Another way to take part in a showcase is to take a short acting course which then culminates in a showcase. Obviously you are not guarenteed an agent at the end of either but it certainly gives you an opportunity and is a proactive to way to get seen.
Below are a few links to companies that offer showcase opportunities.