Doing their due diligence, the Ravens tried out four receivers and two quarterbacks, according to a report from the Baltimore Sun's Aaron Wilson.
<blockquote class="twitter-tweet"><p>Ravens tried out receivers Kamar Aiken, Quentin Sims, Charles Hawkins and Dan Buckner and quarterbacks James Vandenberg and Nick Stephens</p>— Aaron Wilson (@RavensInsider) <a href="https://twitter.com/RavensInsider/statuses/395518733738708992">October 30, 2013</a></blockquote>
<script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>
None of these receivers appear to offer anything substantial and would appear to be practice squad considerations and not long-term options. The quarterbacks were likely brought in to work out the receivers.
UPDATE: Aiken and Stephens were signed to the practice squad after the Ravens released Michael Huff and Marcus Spears. The practice squad positions came open when the Ravens called up Omar Brown and Brynden Trawick to fill the open 53-man roster spot.