Availability calendar

Can I ask how you manage to keep your calendar up to date, I have never managed to quite fathom it out?
As far as I can see I am only able to mark dates that I am available on the calendar - I can not block out dates when I am not available.
So, for example. I am away this weekend so not available to sit - I can see no way to block these 2 dates on my calendar except for trawling through 363 dates marking them as available - am I doing something wrong?

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