Advice for holding a Mindfulness Teachers Planning Day?

Hello,
I work in the National Health Service in the UK. Over the past 18 months we have built up a great team of teachers and support staff for our local mental health team. We are getting together in a few weeks for a day of practice, taking stock of the past 18 months, and planning the year ahead.
I was wondering if anyone had organised a similar event and had any reflections on what worked well / was helpful etc. The first half of the day will be like a silent mini retreat to sink into our practice in the hope that the decisions we make can come from a place of wisdom and compassion.

Any pointers or reflections greatly appreciated!