The commemoration dubbed 'The Great Get Together' was set up by Cox's family and aims to send out a message of hope.
Cox, a mother of two, was shot and stabbed as she arrived for a constituency surgery in Birstall.
She had been elected as Labour MP for the Batley and Spen constituency just 13 months earlier.
Rev Paul Knight of her hometown in Birstall told Premier that people should remember Cox's message of community harmony.
He said: "We can be a focus for good. We've had so many disastrous events over the last few months and we've learnt in our church that we need to be open so that people can come and find space, and they can find God who's speaking to them all the time if they would listen."
St. Peter's Church of which Knight is the leader of, will hold its 'Great Get Together' on Sunday.
He said it's supported by the area's local pub, Chamber of Commerce and by Rotarians.
He added: "Community groups have started working together much more. The events in this area are encouraged by that. I hope it won't just be this year but people would learn this lesson and do more and more together.
Right-wing loner Thomas Mair was given a whole life term after being convicted of her murder at the Old Bailey in November.
The widower of murdered MP Jo Cox has said he is "so pleased" a passer-by who came to the aid of his stricken wife has been recognised for his bravery.
Bernard Kenny, who was stabbed in the abdomen as he tried to stop neo-Nazi Mair attacking Mrs Cox was awarded the George Medal one year on from the murder.
Two West Yorkshire Police officers, Pc Craig Nicholls and Pc Jonathan Wright, who arrested Mair have been awarded the Queen's Gallantry Medal.
