It’s impossible to predict exactly when the aurora will occur, but there are “space weather” forecasts that give us an indication of what to expect. It can get quite complicated as a number of conditions must be right. Just because the activity is high doesn’t mean good aurorae are guaranteed. In particular, the magnetic field of the solar wind must be pointing southwards for it to interact with the Earth’s magnetic field in the right way to cause the aurora. Take a look at the Science page on what causes the aurora if you haven’t already.
To help tourists and tour guides, the Live Aurora Network is establishing a network of live cameras across the auroral zone. To begin with, they have set up four cameras across Iceland, with more to follow across the Northern hemisphere. A remotely linked algorithm then detects when aurorae occur. The network plans to launch an app that alerts app users and provides travel directions to where the aurora is occurring. For the time being, follow the Live Aurora Network’s Twitter account and subscribe to the Live Aurora Network YouTube channel to watch their incredible camera footage.
Also look for local Facebook groups where people share local information and sightings.