The only relevant information about halvings are that Chinese scammers who have a centralized monopoly on mining and selling mining machines have an incentive to attempt to rig the price upwards to continue the profitability of their monopoly scam rather than turning the miners off.  Then others like the Winklevoss who have attained a monopoly on supply have an incentive to try and help them do so.  So it's a crowd sourced pump and dump scam.  But these actors still have to gauge if there's any actual buyers (fools) for their pump and dump or it just implodes when they try to rig it and they lose a bunch of money.