It's not ideal but I suspect they'll end up playing Austria on the 21st. Austria was scheduled to play Germany in an exhibition game just prior to Canada/Sweden. If neither Germany nor Sweden can play in those games it only makes sense to still get Austria, and Canada a game against each other
There's also a Slovakia/Russia game on that day. Ideally you'd move Slovakia to play Austria, and Canada plays Russia, and then perhaps fit Canada/Sweden in on the 23rd rather than Canada Russia, and get Russia to play Switzerland which was Sweden's scheduled opponent on the 22nd, but I'm not sure they'd be able to mess with the schedule that much