33 COVID-19 cases linked to Cambridge hockey clubs: Waterloo Public Health Starting Jan. 4, the third dose of vaccinations will open up to all of those who are over the age of 18.It says it is increasing capacity at its largest clinic, Cambridge Pinebush, in an effort to accommodate those in need of a third dose booster shot and others, including children aged 5-11 who need their first shot.The clinic in Wellesley will also be open more days as the region looks to get residents of rural communities vaccinated as well.The Hockey Hub clinic is also making a return appearance to Bingemans on December 22-23 with more dates to follow.The region says this model has been “an efficient and convenient way to ramp up Waterloo Region’s capacity to.