also move autumn ws to past and add tentative dates to workshops page

Note to self, could we connect these? To not have two places with same info that need to be updated

Author: samumantha

content/workshops/upcoming.md

@@ -9,7 +9,7 @@ date = 2025-07-09
 <!-- If you edit this section, also update the date on top of this page. This
 is important for RSS feed. -->
 
-- [CodeRefinery tools workshop (online)](https://coderefinery.github.io/2025-09-09-workshop/) - September 9-11 2025 + 6 following Wednesdays (new format - register now!)
+Tentative dates for compact Spring 2026 CodeRefinery workshop: 17.-19. and 24.-26. of March 2026; sign up to our newsletter to get to know about registration etc.
 
 Don't want you to miss a workshop or event? The best
 way to stay informed is to join [our newsletter](@/about/newsletter.md)
@@ -26,6 +26,7 @@ to list your workshop/event here.
 
 ## Recent workshops and events
 
+- [CodeRefinery tools workshop (online)](https://coderefinery.github.io/2025-09-09-workshop/) - September 9-11 2025 + 6 following Wednesdays (long format)
 - [BioNT- NumPy and Pandas fundamentals for handling biological datasets](https://biont.biobyte.de/HklzRkuZRjS6ORgHCiA-HA) (May 27-28, 2025)
 - [CodeRefinery tools workshop (online)](https://coderefinery.github.io/2025-03-25-workshop/) (Mar 25-27 & Apr 1-3, 2025)
 - [Python for Scientific Computing (online)](https://www.aalto.fi/en/events/python-for-scientific-computing-5-7november2024) (Nov 5-7, 2024)