Hello Ahmed,
Apologies for the late reply. We asked the organizers and they said that they will try to accommodate the workshops in hybrid mode; only the main conference will be physical.
Regarding registration, yes, it will be required for the presenter of the accepted paper, but we are still waiting for the main conference organizers to announce the registration fees.
We will update this thread once we get more information from the main conference.
Thank you,
Dimitris