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

March 2019

23 - Heart & Soles 6K/10K (Santa Clara)
23 - Sunrise Marathon San Francisco/NorCal 5K/10K/Half Marathon (Novato)
24 - Napa Valley Women's Half Marathon (Napa)
24 - Oakland Running Festival 5K/Half Marathon/Marathon (Oakland)
24 - Racing Hearts 5K/10K (Palo Alto)
31 - Hellyer 5K/10K/Half Marathon (San Jose)
31 - Modesto 5K/Half Marathon, Marathon, (Modesto)
31 - Wildflower Run 5K/10K (Morgan Hill)

April 2019

  6 - Annadel 5K/10K/Half Marathon (Santa Rosa)
  6 - Lantern Run 5K/10K/Half Marathon (San Francisco)
  6 - Night Sweats Trail Marathon/8K/15K (Sausalito)
  6 - King Richard 5K/10K/Half Marathon (San Jose)
  7 - Napa Valley Silverado 5K/10K/Half Marathon (Calistoga)
  7 - Rock n' Roll San Francisco (San Francisco)
13 - Diablo Trails Challenge 5K/10K/Half Marathon/50K (Walnut Creek)
14 - Airport Runway Run 2K/5K/10K (San Carlos)
14 - Pleasanton Run for Education 5K/10K/15K (Pleasanton)
14 - Presidio 10 - 5K/10K/10M (San Francisco)
20 - Big Bunny 5K (Cupertino)
27 - Western Pacific 5K/10K/Half/Full Marathon (Fremont)
28 - Big Sur International Marathon (Big Sur)
28 - OM Run 5K/10K/Half Marathon (Los Gatos)
28 - Silicon Valley 5K/10K/Half Marathon (San Jose)
28 - Run Santa Clara 5K (Santa Clara)