Do I qualify Visa free visit to shenzhen

I’m Canadian with Canadian passport traveling to Hongkong for business with return ticket to Canada after 7 days in HK . During my visit to Hongkong, I would like to visit shenzhen for one day(24 hours). Do I need a visa or am I qualified for the 24 hour visa free travel to China? If I qualified for the visa free travel to China then how do I apply for the visa free travel and where should I apply?