Youngsters at St Teresa's Catholic Primary School in Cleveleys were left inspired after two volunteers from the charity Free The Children gave a presentation.
Visitors Giustina and Darren told personal stories about how they themselves had brought about change including working as volunteers in Ecuador and leading groups to Kenya.
The Canadiann-based charity was founded in 1995 by a 12-year-old Canadian youngster to fight child labour around the world.
Since then it has grown into an organisation with more than one million young people involved in programmes in more than 45 countries.
Jennifer Ismay, Year 6 class teacher at the St George's Avenue school, said her pupils were inspired by what they learnt.
She said: "The children came out of the assembly brimming with ideas of what they would like to do.
"These ideas are not just only for the school, but in the community or even the wider world. The school does try to promote as many things as we can in school such as Fair Trade."