There are strikes in Greece affecting all workers and.or special groups. ferries are disrupted as are airports, public transport,banks -everything.
A bit of a drag if you get there a day late and the hotelier says -sorry, you didn't turn up . The concept of force majeure may not be appreciated by some greedy hotelier -and I've spent decades dealing with Greek hoteliers, especially on the Greek isles.
I assume you're talking about Sept/Oct? After which time Folegandros becomes an almost deserted rock until April -quite relaxing if the weather doesnt turn....