Thousands of Colorado teachers rallied in Denver on Thursday and more were expected Friday in a bid for more school funding, canceling classes for over half of the state’s students.

Thursday, the AP reported that more than 10,000 educators rallied around the Colorado Capitol, many using personal time to attend. They chanted, “Education is our right” and “We’re not gonna take it anymore” and drew honks from passing cars.

Thursday’s crowd included large numbers of teachers from Jeffco Public Schools and the Douglas County School District; Denver Public Schools teachers are expected to gather Friday.

Colorado lawmakers have agreed to give schools their largest budget increase since the Great Recession. But teachers say the state has a long way to go to recover lost ground because of strict tax and spending limits.

Since lawmakers don’t have the power to raise taxes without asking voters, they’re not expecting an immediate fix. The teachers’ union is backing a ballot initiative to raise taxes on people earning more than $150,000 a year and corporations.

They’re also watching changes made to the state’s pension system.