The event, featuring cultural and cooking demonstrations, speeches and visual displays, will be at Nhill Uniting Church Hall on March 21.

Harmony Day committee member Angela Stewart said the event would help connect community members. "For us, it is about bringing together all the different cultures and members of our community to celebrate and recognise what a diverse range of cultures we have in Nhill," she said.

"The diversity is fantastic because I think it shows a richness to our community and it is wonderful to have everyone working together in the community.

"Harmony Day is to help promote and celebrate the diversity of our community and Australia as a nation as well."

Ms Stewart said diversity among Nhill's residents had boomed during the past decade.

"I was away from Nhill for 12 years and when I came back at the end of 2011 I saw how diverse the Nhill community had become," she said.

"Having been away for so long, I noticed how many different cultures we've had come along, join our community and call Nhill home."

Ms Stewart said people wanting more information or to participate in Harmony Day could call Nhill Neighbourhood House on 5391 2196.

Council community development director Phil King said Harmony Day was an opportunity for people of different nationalities to celebrate their culture.

"There are 29 different nationalities living in Nhill and this is a way of council supporting those different nationalities and cultures," he said.