Twitter has finally figured out that the search function deserves more than a tiny link at the very bottom of the screen - there's now a nice search box at the top right above your profile pic, as well as a "trends" drop down to the left of it which will show the top trending keywords at that moment. (If this hasn't appeared on your twitter page yet, just wait a day or two.)

If you're looking for a hashtag for a conference going on right now, it will likely appear here, assuming there are enough Tweeps in attendance. Kool and the Gang!
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