Two options:
Link has a little story about each event or the more traditional listing.
https://sweattracker.com/Find/Calendar

September 2019

13 - Marin Moonlight Run 5K/10K (Corte Madera)
14 - Drag-N-Fly 5K/10K/Half Marathon (Antioch)
14 - Headlands Hundred (Rodeo Beach)
14 - Night Sweats Trail Run (Sausalito)
15 - Alameda Running Festival 5K/10K/Half Marathon (Alameda)
15 - Clo Cow 5K/10K/Half Marathon (Petaluma)
21 - Los Gatos Creek Trail Run (Los Gatos)
21 - Trail Hog 5K/10K/Half Marathon (San Jose)
22 - Golden Gate Bridge Vista 10K (San Francisco)
22 - Teal Run 5K (Campbell)
22 - Whiskey Hill Redwood Run 10K/Half Marathon/Marathon/50K (Woodside)
28 - HERS Keep Abreast 5K/10K (Fremont)
28 - Rocky Ridge 5K/10K/Half Marathon (San Ramon)
29 - Martinez Run for Education 5K/10K (Martinez)
29 - Montclaire 5K (Los Altos)
29 - Napa Half Marathon (Napa)
29 - Tiburon 5K/10K/Half Marathon (Tiburon)