The case study in Dafen school represents a successful whole school experience of adult education through the EntreCompEdu continuing professional development programme (CPD). It represents how teacher collaboration enhances collective engagement to develop creative, innovative, and risk-taking abilities through teaching practices. It portrays how teachers’ collective engagement has an amplifying impact upon implementation, energy, and confidence; especially influencing the entrepreneurial practice on student learning and the culture of a whole school. It validates how the headteacher and teachers collaborative action enhanced the adult learning in adoption of the new Welsh curricula. In this study we propose that the success of the teachers’ professional development in learning to apply entrepreneurship education stems from a double loop of collaborative adult online learning and collective engagement under a pressure from the new entrants; a new curricula reform set by the Welsh government and the Covid-19 lockdown.