National Blood Donor Week continues, Canadian Blood Services across the country, including in Regina, is calling on people to donate.Canadian Blood Services in Regina says it needs to fill more than 500 open appointments by the end of June.Across the country, 24,000 donors are needed. “Demand for blood in the last two weeks has returned to near pre-COVID-19 levels as hospitals resume elective surgeries and procedures that were put on hold due to the pandemic,” said Rick Prinzen, Canadian Blood Services chief supply chain officer and vice-president of donor relations.“Meanwhile, to maintain physical distancing and other safety measures in our donor centres, how much blood we can collect across the country is currently at 90 per cent.