We are pleased to announce our on 26th – 28th October 2021 at the Paul Scherrer Institute in Switzerland. We invite you to block these dates in your diary! The half-day joint symposium open to external stakeholders (scientists, users and decision makers) will start after lunch on Tuesday 26th October. Wednesday 27th October will be dedicated to internal meetings among the work package members of both projects. The meeting will conclude with a wrap-up session on Thursday 28th October morning. A detailed agenda will follow.