Should I sell everything I've been holding on to as soon as markets open, or wait?

There seem to be a few conflicting was of looking at it:

• Maybe prices will start off low and rise over time, because of the influx of people dumping stock into the market

• Maybe prices will start off low because everyone has been dumping all their gold into religion

• Maybe prices will start off high for a few days, because people have been saving for markets to open and buy everything quickly