Update August meetup details, permanent location, and sync wiki

- Establish West Fargo Public Library as standard meeting location
- Sync August 2026 Gridfinity challenge and September upcoming challenge
- Update Copilot instructions with location and date sync guidelines
- Update submodule wiki-fargo3d

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

wiki-content-gitea/Important-Dates.md

@@ -5,12 +5,14 @@
 ## Upcoming Meetup Schedule
 
 ### Next Meetup
+
 - **July Meetup: July 15th, 2026** ✓ *Completed*
   - Judging of July 2026 Challenge ("Scarf Seams")
   - Challenge announcement for August 2026 Challenge ("Gridfinity Extravaganza")
 
-- **August Meetup: August 19th, 2026** (Estimated - 3rd Wed)
+- **August Meetup: August 19th, 2026**
   - Judging of August 2026 Challenge ("Gridfinity Extravaganza")
+  - Challenge announcement for September 2026 Challenge ("[Theme TBD]")
   - Focus on Gridfinity system and organizational efficiency
 
 ## Regular Meeting Schedule
@@ -35,7 +37,7 @@
 - **Submission Deadline**: May 20, 2026
 - **Judging**: May 20, 2026 meetup
 
-See [Current Challenge](Current-Challenge) for complete details.
+See [Challenge Archive](Challenge-Archive) for complete details.
 
 ### June 2026: "Show & Tell Extravaganza!"
 
@@ -51,7 +53,7 @@ See [Challenge Archive](Challenge-Archive) for complete details.
 - **Submission Deadline**: July 15, 2026
 - **Judging**: July 15, 2026 meetup
 
-See [Current Challenge](Current-Challenge) for updates.
+See [Challenge Archive](Challenge-Archive) for complete details.
 
 ### August 2026: "Gridfinity Extravaganza"
 
@@ -59,18 +61,16 @@ See [Current Challenge](Current-Challenge) for updates.
 - **Submission Deadline**: August 19, 2026
 - **Judging**: August 19, 2026 meetup
 
-See [Current Challenge](Current-Challenge) for updates.
+See [Current Challenge](Current-Challenge) for complete details.
 
-## Meeting Locations
-
-**July & August 2026 Meetups:**
-West Fargo Public Library
-215 Third St. E.
-West Fargo, ND 58078
+## Meeting Location
 
 **Standard Location:**
-2222 7th Ave N  
-Fargo, ND 58102
+West Fargo Public Library  
+215 Third St. E.  
+West Fargo, ND 58078  
+
+*(Note: We will occasionally have one-off meetings at alternative venues, which will be announced in advance.)*
 
 ## Contact Information
 
@@ -78,4 +78,4 @@ Fargo, ND 58102
 
 ---
 
-**Last Updated**: July 18, 2026
+**Last Updated**: August 16, 2026