Version 7 of the Sandbox datasets, in preparation for Trial 2 (posted March 5, 2021), are available from the Sandbox Dataset page in the C2_Sandbox section.
Trial 1 results are now available. All Trial 1 datasets may be run with a Sandbox submission; the synthetic datasets may be downloaded but not the industry ones.
Familiarize yourself with the Problem Formulation (updated February 19, 2021), Input Files and Formats, Output Files and Format, Rules, Scoring, and the Timeline (summarized below; updated January 29).
See References/Time Limits for information about time limits.