If you can't find it, you can be the first to add a description about it. If a hashtag is about an event you can link to it and add dates so everyone knows what it's about.
On 27-May-2019 Seth said Hello, You can now get a complete list of all your website visitors within the last 12 months using the new Web Leads 2.0 Extension. The Web Leads report contains all company names, addresses, phone numbers, websites, contact person, email addresses, and important metrics that track your website’s most popular pages. For more details and free access, visit the link below. http://bit.ly/analyticsleads Sincerely, Fastbase [Extension to Google Analytics].