Logistics of Scheduling

Hello, I am working on a business plan and considering how to include periods for time away (i.e. vacation time, conferences, etc.)  If my business is primarily 1:1 coaching or business services, I am wondering how to handle periods where I am unavailable, but my clients want or expect to maintain a schedule.

My mind says that I would need to consider my clients needs individually and make accommodations which includes potentially having to work on vacation. I think it is essential to have time away to recharge so don’t really want to create a business where this would be required. I also see a problem with just suspending service as this limits the amount of flexibility I will have. Is it common to have an arrangement with a subcontractor to handle things. Is their a best practice for this? What do some of LCS certified coaches with businesses do to manage this?

Thanks for your insights.