After signing up in the related webpage you can register yourself as:
ONLY ATTENDING GA CONFERENCE
1. if you ONLY attend the GA2020 virtual conference. You've got nothing else to do.
2. but if you like to have the conference proceedings. You have to:
___A. getting the conference proceedings downloading the e-book before the conference
___B. getting the conference proceedings receiving the paper book of the proceedings before the conference
AUTHORS PRESENTING THEIR WORK
3. if you are an AUTHOR, presenting a paper, an artwork, a poster, an installation or a live-performance:
___A. You have to register with the reduced fee
___B. if you are the second author You can register with extra reduced fee
___C. if you register after October 30 you have to pay the full fee