Timesketch summit 2021 (#1557)

* Timesketch summit 2021

* remove twitter

* minor change

docs/events/2021_timesketch_summit.md

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+# Timesketch Summit 2021
+
+On **March 10th 2021 16:00 - 22:00 UTC** the first Timesketch summit will
+take place.
+
+## About Timesketch
+
+Timesketch is an open source tool for collaborative forensic timeline analysis.
+Using sketches you and your collaborators can easily organize your timelines and
+analyze them all at the same time. Add meaning to your raw data with rich
+annotations, comments, tags and stars.
+
+## Agenda and talks
+
+The agenda will be posted on
+[Github](https://github.com/google/timesketch/tree/master/docs/events/2021_timesketch_summit.md)
+before the end of February.
+
+- Presentations: 16:00 - 19:00 UTC
+- Workshops: 19:00 - 22:00 UTC
+
+## Where
+
+The Timesketch summit will take place virtually.
+
+## Who can participate
+
+Everyone who is interested in Timesketch is welcome. **The event is free**.
+
+## Registration
+
+Please use the [Google form](https://forms.gle/1D23n4SkoCPay1eDA) to sign up.
+
+## Call for Presentations & Workshops
+
+We invite Timesketch users and developers to submit a presentation or a workshop
+topic. Anything related to Timesketch is welcome, such as analysis techniques,
+deployment and development to name a few.
+
+We are looking for short format talks 20 min + 10 min Q&A. Workshops will have
+a 3 hour time slot.
+
+Please use the [Google form](https://forms.gle/1D23n4SkoCPay1eDA) to suggest
+your contribution to the summit. The call for presentations and workshops will
+run till **Feb 25th**.
+
+If you have ideas outside of the suggested formats, feel free to reach out.
+
+## Questions
+
+If you have any questions, please reach out to the team via 
+[slack in the Timesketch channel](https://github.com/open-source-dfir/slack)