Add PCD @ Somewhere to the PCD map

[github-actions]

Closes #4

This PR was generated from the "New Event" issue form for PCD @ Somewhere.
Submitted by @SableRaf.

Review checklist:

• Event name and short description are ready to publish
• Full event description is ready to publish (or intentionally blank)
• Public contact info is correct
• Date is correct; time is marked TBD — confirm this is intentional
• Venue address and map pin placement are correct
• Check the map and event details page in the Netlify preview (link posted below by the Netlify bot)

[netlify]

✅ Deploy Preview for processing-community-day ready!

Name	Link
🔨 Latest commit	a708b11
🔍 Latest deploy log	https://app.netlify.com/projects/processing-community-day/deploys/69b6c9be41d3470008cfc2aa
😎 Deploy Preview	https://deploy-preview-5--processing-community-day.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.