Yes there are but ferry schedules are usually only released a few months in advance.
This doesn’t help with planning a holiday as I know to my own cost as you can’t assume times of ferries will be same as the previous year (I ended up having to book an extra night in Tenerife when schedule ended up not matching with my booked plane). Not too bad with La Gomera as there will he 3 or 4 departures even at this time of year.
Oh, I see... Thank you, Worslesr! So I should know the times of the ferries around October for Nov/Dec, right?