Propose talk about Gerrit migrations

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 | 11:45 | Gerrit goes multi-site                                                                       |
 | 12:45 | Lunch & Networking                                                                           |
 | 14:00 | [JGit (concrete topic to be decided)](sessions/jgit.md)
-| 15:00 | << Gerrit case study - slot available >>                                                     |
+| 15:00 | [Gerrit upgrades, step-by-step](sessions/gerrit-upgrades-step-by-step.md)                    |
 | 16:00 | Break & Networking                                                                           |
 | 16:30 | Lightning talks <br/>- [Show me your dashboard - 10'](lightning-talks/show-me-your-dashboards.md)
 | 17:30 | End of Day 1                                                                                 |
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+# Gerrit upgrades, step-by-step
+
+Upgrading is always a pain, no matter big or small.
+Gerrit 3.1 is planned to be released on November 2019 and, sooner or later,
+all the current older versions would need to be migrated to a modern 3.x release.
+
+This talk is to demystify the fears of upgrading and covering step-by-step,
+all the DOs and DONTs of the process, from a real-life example of upgrading
+in GerritHub.io and with large Gerrit Enterprise setups.
+
+Join me for seeing in practice how to make your upgrade path smoother and less
+painful. See how the upgrade can be also achieved without having to stop the
+incoming traffic to your Gerrit servers.
+
+*[Luca Milanesio, Gerrit Maintainer / GerritForge Ltd](../speakers.md#lmilanesio)*