Brainstorm supports importing events from a .csv file, the format should be:
EventName, OccurrenceTimeSeconds, DurationSeconds
If that is not the current format of your .csv file you would need to create a new .csv with the expected format, check this post:
Once the events are properly imported, you can average the epochs that correspond to the desired condition (event)
You can create a Scout in that area and plot its activity.