Added instructions for tutorials that need pre-preparation. (#1406)

Co-authored-by: hypha <[email protected]>

Author: t-redactyl

src/content/pages/guidelines.mdx

@@ -215,8 +215,7 @@ that attendees can follow along, or replicate it in a later exercise.
 
 If attendees need to download materials for your tutorial and/or need to set up a special environment
 on their computer: Ask the participants to prepare the setup for your tutorial in advance.
-Ensure that your tutorial description on the europython web site includes setup up instructions.
-(Contact the Programme Committee if you need help with that.) Bandwidth at the tutorials will be limited.
+Ensure that your tutorial description on the EuroPython web site includes setup up instructions. You can add this directly to your talk abstract on Pretalx. (Contact the Programme Committee if you need help with that.) We'd also encourage you to make a post for your tutorial on the EuroPython Discord and share the instructions there as well. Bandwidth at the tutorials will be limited.
 It can cause long delays if all tutorial participants have to download files at the same time at the beginning
 of the tutorial.