Amend Gerrit v3.10 release plan with reference to SAP hackathon

The Gerrit release plan needs updating because of the following
new events:

- v3.10.0-rc2 has been withdrawn, due to a critical issue found
  during E2E testing
- some key features aren't completed yet, including the deletion
  of groups (kudos to Ericsson) and the WorkQueue parking mechanism
  (kudos to Qualcomm)
- SAP organised the Gerrit hackathon 1 week after the release,
  making more convient to delay the release by 1 week

The new release date is therefore the 17th of May 2024.

Change-Id: I739e1ff7ff92047b0a554bac2bbfdb6bddb2b5f4
diff --git a/_posts/2024-02-13-gerrit-3.10-release-plan.md b/_posts/2024-02-13-gerrit-3.10-release-plan.md
index d2187a6..7130c1e 100644
--- a/_posts/2024-02-13-gerrit-3.10-release-plan.md
+++ b/_posts/2024-02-13-gerrit-3.10-release-plan.md
@@ -11,22 +11,22 @@
 
 ## High Level Release Plan
 
-| Date      | Activity                                           |
-|-----------|----------------------------------------------------|
-| Apr  5    | Create `stable-3.10` branch, Release `3.10.0-rc0`  |
-| Apr 12    | Release `3.10.0-rc1`                               |
-| Apr 19    | Release `3.10.0-rc2`                               |
-| Apr 26    | Release `3.10.0-rc3` - Feature freeze deadline     |
-| May  3    | Release `3.10.0-rc4`                               |
-| May  6-10 | Gerrit Hackathon (Offers to host?)                 |
-| May  10   | Final release of `3.10.0`                          |
+| Date       | Activity                                          |
+|------------|---------------------------------------------------|
+| Apr  5     | Create `stable-3.10` branch, Release `3.10.0-rc0` |
+| Apr 12     | Release `3.10.0-rc1`                              |
+| Apr 19     | Release `3.10.0-rc3` (rc2 has been withdrawn)     |
+| Apr 26     | Release `3.10.0-rc4`                              |
+| May  3     | Release `3.10.0-rc5` - Feature freeze deadline    |
+| May  10    | Release `3.10.0-rc6`                              |
+| May  13-17 | Gerrit Hackathon hosted by SAP in Walldorf (DE)   |
+| May  17    | Final release of `3.10.0`                         |
 
 ## Gerrit Hackathon
 
-The Gerrit hackathon is planned during the release week, from the 6th to 10th of May *TODO: Offers to host the hackathon?*
-
-We also encourage all the [JGit contributors and committers](https://projects.eclipse.org/projects/technology.jgit/who)
-to join the event.
+The Gerrit hackathon is planned after the release week, from the 13th to the 17th of May
+at SAP in Walldorf, focused on the [k8s-gerrit project](https://gerrit.googlesource.com/k8s-gerrit)
+and the associated plugins for supporting multi-primary setups in the cloud.
 
 We will also ask the community members to allocate some of their time during the
 hackathon to help with finalizing the release: