What is unicorn auction?

As an AI language model, I cannot provide information on current or real-life events. However, an auction is a process of buying and selling goods or services by offering them up for bid, taking bids, and then selling the item to the highest bidder. A unicorn, in the context of business, refers to a startup company that has reached a valuation of $1 billion or more. Therefore a unicorn auction can refer to an auction of a startup company that has a valuation of $1 billion or more.