Are there meetings?
There is no organized, public meeting that I know of.
What people do is form informal peer groups to discuss the Proactive Twelve Steps.
You too may want to talk to people who might be interested in joining you informally for discussing these steps.
For suggestions on how to proceed with the discussion, see: How to work the 12 steps online workbook.
2018 Mindful Pause / Proactive Mindfulness
See: Demystifying mindfulness - Mindfulness & spirituality - From mindless to mindful - One-minute mindfulness exercise - Mindful listening - Embodied relational mindfulness - Relational mindfulness - Bodyfulness - Existential mindfulness - Reactive vs Proactive quotes & thoughts - Mindfulness exercises - Secular alternative 12 steps