Pertaining to the subject matter, skelligislands.com has released its booking slots for landing tour to Skellig Michael.
However, due to heavy traffic, the booking site is down currently. It seems LOTS of people are rushing into the website to make reservations.
Nonetheless, you may try your luck by keep refreshing the page. I was lucky to make the booking successfully. (Performing the dancing ritual to celebrate this success in front of the computer, literally.)
Meanwhile, another boat operator skellisrock.com has yet to release its booking slots for its landing tour.