Liquidation events do happen every so often, but finding someone with the connections to connect a seller and buyer requires a strong network and a substantial net worth.
> Wish I could find some SpaceX shares on the secondary markets
Unless you’re willing and able to commit at least $5 million (at the very least, $1 to 2 million) it’s not worth exploring. You’re better off buying some merchandise [1] and sticking what you were going to invest in some bonds or a broad-market index.
I'd even say that $5mil is on the low end of what would come up during a liquidation event. However, now there are probably more shares that have been bought and sold a few times, so there might be some more smaller investors willing to cash out.