Update registration details for CollaborationFest 2026

Added detailed registration steps and clarified location information for CollaborationFest.

Author: hmenager

content/page/obf-bosc-collaborationfest-2026.md

@@ -31,7 +31,15 @@ Friday July 17 to Saturday July 18 (right after ISMB 2026), 9:00am - 5:00pm both
 
 ### How to sign up
 
-Due to space constraints, participation in CollaborationFest is limited. Participation is free, but registration is mandatory. A registration link will be available shortly. The exact location will be shared with those who register.
+Due to space constraints, participation in CollaborationFest is limited. Participation is free, but registration is mandatory. A registration link will be available shortly. 
+
+We encourage you to register for ISMB, but the CoFest itself is free. Three easy steps to sign up:
+
+- add yourself to this [spreadsheet](https://docs.google.com/spreadsheets/d/1HvB9nHCBiCrSLWR9BNG5ypMecEbn7MOOnWIZxagQwRo/edit?usp=sharing) to help us gauge interest, coordinate topic groups and logistics
+- add your project ideas in this [document]([https://docs.google.com/document/d/1-tvrtBBcJJ8EhiIXQhjo4B3x796cSb9OG_6ynPVM_zM/edit?usp=sharing](https://docs.google.com/document/d/1x7h4Tx3Y8IrcDSkSs_LylVFzQhjNKmQpwAbizQnyxYQ/edit?tab=t.0)) if you have something in mind,
+- join the #cofest2026 channel in the [OBF Slack](https://join.slack.com/t/obf-bosc/shared_invite/zt-3va3bz5qa-hR9nKXHXO9GmrkddIpJXcQ)!
+
+The exact location is central to Washington DC, and will be shared with those who register.
 
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