Speedrun Tools UK (STUK) is a package I have been developing to assist with speedrun marathons and collaborative events. It's still in development, but does also include a full NodeCG package including layouts, a set of dummy Twitch streams, schedule workbook and participation form, submission voting forms, and event guides that can be read on this site.
If event organisers are looking for help and a solution for putting on streamed events, please reach out. A lot of this system integrates with Oengus, so if you're planning a marathon and would like to use this package, I would strongly recommend setting it up there!
STUK recently had its marathon debut with Speed4 TLC. For a breakdown of that event, check out the blog post.
My biggest ambition is to create a live UK speedrunning event that could be the UK's answer to GDQ/ESA - if this is something that interests you, definitely get in touch!