backend: generate events.json when needed

backend/registration.go

@@ -65,6 +65,9 @@ func treatRegistration(pathname string, team_id string) {
 				if err := genTeamMyFile(team); err != nil {
 					log.Println("Team generation error: ", err)
 				}
+				if err := genEventsFile(); err != nil {
+					log.Println("events.json generation error: ", err)
+				}
 				if err := genTeamsFile(); err != nil {
 					log.Println("teams.json generation error: ", err)
 				}