You will be able to find some dates for this fare starting in late September and into early October, but the most availability is for flights departing in November. Travel is valid for Sunday through Wednesday departures and requires a 3-day or Saturday night stay. This fare is available on Air Canada's website, but the currency conversion from CAD to USD will drive the price up to $500. Therefore, I recommend purchasing this flight through Priceline to save the extra $25. Priceline also offers free 24-hour cancellation should you change your mind overnight.
Searching on Priceline, I could find seats departing DEN on Tuesday, November 12, and returning from PVG on Tuesday, November 20, 2018. Other airlines are offering this route in the low $500 range, so if you have a preferred airline, you can also check the prices that they are offering.
Have a look at our Denver DEN flight deals page for a current list of today's airfare finds.
If you need a room in Shanghai, Hotelwatchdog is offering these accommodations at great values for the dates listed above.