Visit the conference web site for guidance, https://acc2023.a2c2.org/, and use the “Authors” link to access specific instructions. The submission process is scheduled to close on September 23.
If you are new to the ACC, and are considering organizing a Special or Tutorial session, feel free to preview your idea with Russ Rhinehart (russ@r3eda.com), and let his experience help you fine-tune the proposal. (Russ is the ISA delegate to AACC, https://acc2022.a2c2.org/, and has been an ISA Division Director.)
You can find more information on how you can get involved in the attached file.