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 23-Jul-2020 Mary said Hi, I hope you are safe and well. I am reaching to publish a guest post article on your website and will send you some topic ideas for that. If my ideas interest you, I'll send an article on any of the ones chosen by you. The article will be of great quality and is free of cost. I would just need you to provide me a backlink within the main article. Looking forward to your response. Thank you! Regards. Mary Jean.