Add 12 months to the year clause

[amakarudze]

Clarify that the DSF funds only 1 event per city in 12 months.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d14425d) 81.01% compared to head (f1ac04a) 81.24%.
Report is 41 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #951      +/-   ##
==========================================
+ Coverage   81.01%   81.24%   +0.23%     
==========================================
  Files          95       98       +3     
  Lines        2860     2938      +78     
  Branches      269      271       +2     
==========================================
+ Hits         2317     2387      +70     
- Misses        492      499       +7     
- Partials       51       52       +1     

see 12 files with indirect coverage changes

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