Auctioneers Day
Auctioneers Day is held on April 20. It is one of the world’s most ancient professions, having begun more than 2,000 years ago. Third Saturday of April. This event in the second decade of the month April is annual. 
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Auctions were recorded as early as 500 BC. Auctioneers and gavels came later, but at the beginning of the long history of auctions, the proceedings were a little more dramatic. The auctioneer was referred to as the 'Magister Auctionarium', and instead of using a gavel to commence the auction he would use a spear.
The entire Roman Empire was once put up for Auction. The most advanced civilisation in the world was once put up for sale to the highest bidder during the year of 193 AD. Friendly Trans-Tasman rivalry showed it's colours in 2006 when a cheeky Australian listed the entire country of New Zealand for sale.
Most people are well aware of how auctions work. During an auction, an item is placed up for sale and people can bid on it until it reaches a point where no more bids are coming in. The highest bidder is then awarded the item and allowed to take it home after paying for it.
Most auctioneers supply bidders with a catalog ahead of time.
Similar holidays and events, festivals and interesting facts
World Bicycle Day on April 19 (The events of the first LSD trip in April 19, 1943, now known as “Bicycle Day”, after the bicycle ride home, proved to Hofmann that he had indeed made a significant discovery: a psychoactive substance with extraordinary potency, capable of causing significant shifts of consciousness in incredibly low doses);
Garlic Day on April 19
Hanging Out Day on April 19
Poetry And The Creative Mind Day on April 19
Volunteer Recognition Day on April 20
Look Alike Day on April 20
Record Store Day on April 20
International Milk Tea Dumpling Day on April 20 (social media user initiative, 2019);
Chief Accountant Day in Russia on April 21
Civil Service Day in India on April 21
Administrative Professionals Week in USA on April 21
Bulldogs Are Beautiful Day on April 21 (They are related to the Asiatic Mastiff, which, according to historical records, lived in Mesopotamia around 4,000 BC);
Dancing Cow Day in Denmark on April 21 (On the third Sunday of April)