Ethereum's next big upgrade, Shanghai (aka "Shapella") set for Wednesday at 22:27 universal time, 6:27 p.m. Eastern US. 

With the upgrade those who staked ETH for the ETH 2.0 merge will be given access to their coins again - about 15% of the total ETH supply wroth around $33.73 billion will become tradeable again. 

Will there be a sell-off?
Ethereum's price is lower than when most people initially locked up their staked coins, so we're expecting people will continue to HODL if possible.