Add The Aerospace Corporation as Known Instance for InnerSource Hackathon

Add detailed Known Instance based on their InnerSource contribfest
presented at InnerSource Commons Summit 2024 by Tren Baumgarten and
Caroline Jones. Their experience validates the pattern in a
contract-based organization (FFRDC) with 31 participants across 21
departments, 15 tickets closed, and strong post-event engagement.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rrrutledge

patterns/1-initial/innersource-hackathon.md

@@ -76,6 +76,7 @@ All these help scale InnerSource in the organization.
 ## Known Instances
 
 * IKEA (Ingka Group)
+* **The Aerospace Corporation** organized an internal InnerSource "contribfest" inspired by open source contribfests at conferences like KubeCon/CloudNativeCon. Aerospace is a Federally Funded Research and Development Center (FFRDC) where developers charge time to government contracts, making InnerSource adoption especially challenging because work not embedded in funded tasking does not happen. The event was organized by a software best practices team and held as a hybrid event (virtual and in-person in El Segundo, California). They secured dedicated funding so that all 31 participants across 21 departments could charge their time to the event. Tasks were curated with project maintainers, documented with clear definitions of done and impact statements, and organized on kanban boards. At least one maintainer from every participating project was available for Q&A throughout the day. During and shortly after the event, 15 tickets were closed. Notably, one developer used the event to contribute a feature he needed back to an internal library rather than forking it — a direct demonstration of InnerSource solving the "fork storm" problem the company had been experiencing. Two-thirds of participants had never heard of InnerSource before the event, yet 100% of survey respondents agreed that InnerSource would have a positive impact on development and wanted to participate in a future event. Traffic to the company's internal documentation site nearly doubled in the month following the contribfest. See: [Kickstarting InnerSource with a Contribfest](https://www.youtube.com/watch?v=J5KeCHFbnWA) (InnerSource Commons Summit 2024 talk by Tren Baumgarten and Caroline Jones).
 
 ## Status
 
@@ -84,3 +85,7 @@ All these help scale InnerSource in the organization.
 ## Author
 
 * Shanmugapriya Manoharan
+
+## Acknowledgments
+
+* Tren Baumgarten and Caroline Jones (The Aerospace Corporation) for sharing their experience at the InnerSource Commons Summit.