For WWDC this year, I created a shortcut that would allow me, or anyone, that uses Mona for Mastodon to easily be able to easily post their take on the events happenings to their Mastodon account via Apple Shortcuts.
Just run the shortcut, add what you want to say, and voila! it posts it to your account. It also automatically adds the event hashtags for you.
I am also going to be working on updating the shortcut to make it work to were you can select hashtags you would like to add before you post.