fix year for summit social activities

[bbrcknl]

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The link checker found some issues!

Running 3 checks (Images, Scripts, Links) in ["_site"] on *.html files...


Checking 568 external links
Checking 938 internal links
Checking internal link hashes in 57 files
Ran on 130 files!


For the Links > External check, the following failures were found:

* At _site/Summit/2026/program.html:874:

  External link https://vancouver.ca/parks-recreation-culture/stanley-park-seawall.aspx failed (status code 403)

For the Links > Internal check, the following failures were found:

* At _site/index.html:1104:

  internally linking to ../Summit/2026/program.html#social; the file exists, but the hash 'social' does not


HTML-Proofer found 2 failures!
make: *** [Makefile:96: checklinks] Error 1