Hashtags can be great qualifiers for targeting, and this tactic will allow you to target events not listed under Twitters internal event targeting. To create a list based on a hashtag (i.e. for an event) you will need to: 1. Create a Twitter list (make sure you select "private"; if relevant) 2. Create an IFTTT recipe, specifying the hashtag you want to track and the name of the list you just created. 3. For paid advertising, once your list is built, you can export it and then import it to Twitter as a tailored audience 4. Create campaign targeting the new custom audience