Libertarians and Individualists have a long history of making predictions about forthcoming events, going all the way back to the 1999 election results. The archive of these predictions can be viewed here.
At the 2019 Libertarian Seminar in Velddrif Trevor Watkins setup a Prediction Market, using statements written on a whiteboard. In order to make the results of this market more accessible, and to encourage further predictions, Trevor has setup these Predictions pages on the IM website.
You can propose new predictions, submit your wagers for existing predictions, and review the results of past predictions here.
You can also visit a leading prediction website called Prediki here.