Resolving Polymarket prediction markets for June 19th and 20th as 'No' because nothing happened on those dates follows historical precedent, not some new pattern.
The playbook has always been that a market resolves based on its specified timeframe, regardless of what happens later; it's like a wedding date — if the band doesn't show up on Saturday, that's the outcome for Saturday, even if they play a different gig on Sunday.
Future events simply don't retroactively change past conditions for these markets.
It's how these systems have long worked to maintain clarity and trust.