Berkhamsted School will play host to more than 200 teachers from across Herts on Saturday.
The Teaching, Learning and Assessment Conference - now in its second year - will aim to unite the state and private sectors in a collaborative approach towards education.
The function is run by teachers for teachers with a focus on the practical elements of learning.
Elise Foster, co-author of educational book The Multiplier Effect, will open the conference and lead a workshop on educational leadership.
Dr Andy Williams, head of Holmfirth High School, will close the day.
A wide range of workshops, run by teachers who are giving up their time to share their expertise, are on offer to delegates.
They will be run by people from academies, grammar schools, primary schools, independent senior and prep schools, pupil referral units and other institutitions.
Organiser and deputy head of boys for Berkhamsted School Nick Dennis said: “I think we’re the most inclusive educational conference out there.
“Secretary of State for Education Michael Gove talks of a ‘Berlin Wall’ between the maintained and independent sectors.
“This is clearly an example where the division is not as hard as he would suggest and where people focus on the work that matters: with students.
“Excellent teaching is not bound to any particular education sector and this event is a celebration of that fact.”