Update README.md

README.md

@@ -14,6 +14,21 @@ NOTE: All times tentative.
 
 ![image](https://github.com/nipreps/202405-sprint/assets/83442/e7e75e81-6636-4cba-8170-313dec1005c7 "Meeting Schedule")
 
+The general structure is intentionally free-form, to allow participants to self-organize.
+We will begin each day with a period for planning, checking in, and requesting assistance from the whole group.
+
+We strongly encourage taking walks and coffee breaks as needed, and space can be found for smaller discussions.
+
+## Agenda
+
+We are using a [collaboratively edited agenda](https://hackmd.io/@NiPreps-technical-monitoring/2024-hackathon-agenda/edit)
+on the HackMD platform.
+Please use this to propose projects or points of discussion.
+Projects are welcome to link to GitHub issues or discussions,
+if that is a more convenient way to organize work.
+
 ## Lodging and Logistics
 
-Coming soon.
+All in-person participants should have received instructions to set up an account
+that will allow us to book their flights and hotels, if needed.
+Please contact Oscar Esteban or Chris Markiewicz immediately if you have not.