Update Eryk's placeholder

Change-Id: I875ee2217506f3e547f9eaee94079982c231ba18
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 | 09:30    | [What's coming in 3.11](sessions/whats-new-gerrit-3.11.md)                                                        |
 | 10:00    | [Q&A with the Gerrit maintainers](sessions/maintainers-qa.md) |
 | 10:30    | [Challenges after Qualcomm's upgrade to 3.5 from 2.7](sessions/challenges-after-upgrading-to-3.5-from-2.7.md)     |
-| 11:10    | [placeholder - Hackathon Outcome: Fix ls-project when it fails with missing tree.]|
+| 11:00    | [Upgrade to Gerrit 3.5 takeaways](sessions/upgrade-to-3.5.md)                                                     |
 | 11:15    | [Sustaining Git repo performance under heavy load](sessions/sustaining-git-repo-performance-under-heavy-load.md)  |
-| 12:00    | Unconference Schedule layout
-| 12:15    | Lunch & Networking                                                                                                |
+| 12:00    | Lunch & Networking                                                                                                |
 | 13:45    | [Unconference](https://tinyurl.com/ybe482yh)
 | 17:00    | End of the day                                                                                                    |
diff --git a/sessions/upgrade-to-3.5.md b/sessions/upgrade-to-3.5.md
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+# Upgrade to Gerrit 3.5 takeaways
+
+I will talk about issues found during 3.5 upgrade for a customer that resulted
+in code changes in Gerrit 3.5.
+
+*[Eryk Szymanski, Digital.ai](../speakers.md#eszymanski)*
diff --git a/speakers.md b/speakers.md
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 repositories.
 
 [LinkedIn](https://www.linkedin.com/in/lucamilanesio/)
+
+### Eryk Szymanski - Digital.ai {#eszymanski}
+
+Eryk is leading Digital.ai's TeamForge Git Engineering team in Berlin.
+
+[LinkedIn](https://www.linkedin.com/in/eryk-szymanski-94b92ba/)