Roughly every two years, the ICAPS conference hosts the International Planning Competition (IPC), in which the participating planning systems compete against each other on a set of planning benchmarks unknown to the participants. In the years in between other competitions related to planning are sometimes carried out, they cover -- to provide just two examples -- proving unsolvability or concern modelling assistance.
The planning competitions cover different problem classes like classical planning, planning under uncertainty, planning with time -- or hierarchical planning! These are usually organized in "tracks", so any IPC of a particular years may have multiple tracks, one track per problem class.
The IPC 2023 will have multiple tracks, one of which is on HTN planning again! All news concerning this IPC can be found on its website: https://ipc2023-htn.github.io/ (or simply ipc2023.hierarchical-task.net). Its organizers are:
In 2020, the IPC covered one track only, which was on Hierarchical Task Network (HTN) planning. It featured however multiple subtracks, one for partially ordered HTN problems, and one for total-order HTN problems. This was the first time HTN planning systems competed against each other in an IPC. For results, competing planning systems (source code and executables), and more -- visit its website: ipc2020.hierarchical-task.net. Its organizers were: