Sheffield is competing for a slice of a multi-million pound fund designed to improve life for residents.
A range of innovative ideas on reducing air pollution, helping people to get more active and giving career advice to young people are being drawn up in a bid to help city bosses unlock millions of pounds in EU funding.
The Sheffield Collaboration Network, which includes the city council and Sheffield First, is working with bright sparks to prepare its entry for the Mayors Challenge, run by Bloomberg Philanthropies and open to cities across Europe.
The competition is offering £4.2 million to those who come up with the best ways to solve major challenges.
A shortlist of ideas has been drawn up and will be developed at an ideas lab at the Electric Works in Sheffield city centre on Saturday.
Around 50 people are due to attend to discuss them.
The best idea will be selected for submission ahead of the deadline on January 31.
Coun Leigh Bramall, cabinet member for business, skills and development at Sheffield Council, said: “The Mayors Challenge is a great opportunity to showcase on a much larger scale what bold and creative ideas we can generate when we work together as well as potentially bringing funding to the city.
“We have taken a unique approach to developing our entry by identifying issues relevant to Sheffield and inviting people from across public sector organisations, businesses, social enterprise groups and individuals to help us develop the city’s submission.
“The event at Electric Works will be crucial in shaping the final entry from more than 40 exciting ideas we initially received.”
The winning city will be announced in October.