Hi ​@Midwestgardengal - Thanks for reaching out!

In this case, you are in full control of the date range of the event. you can adjust this option under the Availability Tab in your event settings: 
 

In this case, the limit is set to 60 days, but it can be changed to whatever works best!

Since you do seasonal work, you can do one of the following:

• You can set and adjust a date-range for the event, to mark yourself available March-June, then adjust it to be available Sept-Oct:

  

• If you don’t want to have to go in and change it each time, you can set Date-Specific Hours and add those times in manually here:

  

  

  
  This way, you’ll only be available when you’d like on those specific days!

Let me know if you have any questions on this!