As before, the proceedings of the Symposium will be published with the American Institute of Physics (AIP). Instructions on the length for different Review, Highlight and Oral and Poster contributions will be provided in due time, as well as links to the required packages/macros to prepare them.
You can check previous proceedings of the Gamma-ray Symposium here:
For the Gamma2020 edition, perpetual on-line access to the proceedings has been granted. Proceedings will be free-to-read and available to researchers worldwide without any fee to access or download the papers.