Students, parents and staff, as well as plenty of old Collegians, attended the event held on the Sturt Street oval on Saturday afternoon. 

There was music, face painting and a rock climbing for entertainment, while a range of different food and drink options kept the crowd fed and watered.

Soul band Saskwatch, which includes former Clarendon student Tom Pettit in its line-up, were one of the highlights for the day, showing the college bands how it's done. 

Organiser of the 150th anniversary celebrations Jo Ruchel put the overall crowd for the day at 2500 and said people had come from around the country to attend.

"I think it's really important to be able to celebrate the 150th with the whole community and everyone invited," she said. 

Ballarat Clarendon College vice principal Jan McClure said it was a fantastic day that brought together everyone with a connection to the school.

"I think it's important to have these celebrations so we know where we have come from and what's possible," she said.