[CHORE] add May release notes

[Dana Bauer (danabauer)]

What's in this PR?

• may release notes
• update to config with fall back release date
• update release calendar
• closes write May release notes #395

---

[github-actions]

Super-linter summary

Language	Validation result
JAVASCRIPT_ES	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
SQLFLUFF	Pass ✅

All files and directories linted successfully

For more information, see the GitHub Actions workflow run

Powered by Super-linter

[github-actions]

🗺️ OMF Docs previews are live!

🆕 Auto-gen schema site (beta)	https://staging.overturemaps.org/docs/pr/396/index.html
🗂️ Auto-gen schema ref	main@a175aa2
🌍 Repo schema site	https://staging.overturemaps.org/docs/pr/396-no-autogen/index.html
🕐 Updated	May 20, 2026 18:54 UTC
📝 Commit	1183568

Auto-gen schema site is now available. This is an early preview of a future workflow where we will automatically generate and publish reference docs for the Overture Maps Format schema.

The auto-gen schema site may contain incomplete or inaccurate information as we are still refining the generation process, so please compare against the repo schema site and refer to the official Overture documentation for authoritative information.

Note

♻️ This preview updates automatically with each push to this PR.

[github-actions]

Super-linter summary

Language	Validation result
JAVASCRIPT_ES	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
SQLFLUFF	Pass ✅

All files and directories linted successfully

For more information, see the GitHub Actions workflow run

Powered by Super-linter

[github-actions]

Super-linter summary

Language	Validation result
JAVASCRIPT_ES	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
SQLFLUFF	Pass ✅

All files and directories linted successfully

For more information, see the GitHub Actions workflow run

Powered by Super-linter