1. Identify a hashtag for your conference.
A hashtag is a key word or abbreviation preceded by the hash or number symbol such as #EC10. Hashtags are adopted by event organizers to encourage conference participants to use in their tweets. Hashtags were created as a way to search and aggregate information on Twitter. More information on hashtags.
2. Search to see if anyone else is using your hashtag using one of the tools listed below.
If not, list it with these same tools. There is not an official hashtag registration system.