The International Artificial Intelligence Planning and Scheduling (AIPS and ICAPS) Conferences have used a variety of named during their history… now up to 30th International Conference on Automated Planning and Scheduling due to held in nancy, France but due to the Corvid-19 pandemic run as the first virtual event. A list of the international AI Planning Conferences is available at: https://dblp.org/db/conf/aips/
This numbering misses out the first event in June 1990 which we can maybe think of as “Conference Zero”…
First International Conference on Expert Planning Systems, Brighton, UK, June 27-29, 1990. https://dblp.org/db/conf/aips/aips1990.html
There are also European Conferences on Planning, which had a very broad, beyond Europe, participation… More details at https://www.icaps-conference.org/conference-series/