Add PCD @ Chicago to the PCD map

[github-actions]

Note

The Plus Code was auto-recovered from the user's input (R8PX+7G9) using the city as a reference. Please verify the map pin placement is correct.

Closes #14

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

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 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]

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