You could create an XFAI plan for what you consider your A race, then pin the other events to the Planner, and recast the plan around them.
This assumes you have prior race activities on file that you can pin as your B events.
HOW TO: Adjust Forecast Around Preferred Workout/Activities - How To - Xert Community Forum
If the events are of equal importance you could plan for the first one, take a recovery week, then plan for the next in the series and repeat. This assumes the dates are spread far enough apart to support training in blocks.