For [#GPN19](https://entropia.de/GPN19) my Mastodon instance [fem.social](https://fem.social) wants to get all posts for this hashtag. Most users at this event are connected to the instance [chaos.social](https://chaos.social).
We have a script on one of our servers which streams all posts for specific hashtag from [chaos.social](https://chaos.social) and puts the URLs of those posts into the search entry of our own instance. Thus, the URLs will get fetched by our instance and the posts is added to our hashtag timeline.