Registration is directly handled by ESWEEK:

NOTE: For this year, as ESWEEK has moved to a virtual event format, the registration fees are significantly reduced. 

For ESWEEK associated workshops, authors of accepted papers and attendees should select the registration option:

"Conference/Symposium/Workshop/Tutorial Attendee"

Note that this registration allows you to attend all ESWEEK events!

In the registration form there is the question:
"What is the primary event you are registering for?" for this question you can just select the one of most interest to you (even if you are probably not attending).