National Mint Julep Day 
Were you desperately hoping for a refreshing bourbon cocktail but frustrated that you didn’t have a good enough excuse? Thankfully for you, Mint Julep Day is here to pander to your wildest fantasies… just as long as those fantasies involved sipping this classic cocktail.
Mint julep originates in the southern USA and still counts this area as its heartland. This is especially true of Kentucky where the annual Kentucky Derby horse race sees around 120,000 juleps served each year. Premium versions of the drink are served in gold-plated cups with silver straws at a cost of $1000, but you don’t need to spend quite as much as that to enjoy the day. The ingredients are simple: bourbon, mint leaf, sugar and water. However, no two bartenders seem to make the drink in the same way, which is all the more reason to sample a few before this special day is over!
https://www.daysoftheyear.com/days/mint-julep-day/
Loomis Day 
commemorates Mahlom Loomis, who patented his wireless telegraphing inventions on May 30, 1872 (whilst working as a dentist in Washington DC).
He had actually claimed to have succeeded in wireless telegraphy some 6 years earlier, though with no witnesses present to see this, May 30th is one of the earliest official recognitions of his triumph.
https://www.daysoftheyear.com/days/loomis-day/
Neighbor Day 
Even though the exact origins of Neighbor Day cannot be accurately traced, as the holiday seems to have popped up almost randomly in various places at various times, one thing is universally valid : Neighbor Day is all about caring. Whether you’re looking to bury the hatchet or just get to know your neighbors better, Neighbor Day is the perfect time to do so.
There are no rules written in stone as to how to celebrate Neighbor Day, so you’re free to use your imagination: throw a party, invite some neighbors over or go out with them – everything works as long as it will bring you closer to your neighbors and allow you to get to know them better.
Despite the fact that Neighbor Day lasts just a day, that doesn’t mean it should be the only day to care about your neighbors.
https://www.daysoftheyear.com/days/neighbor-day/
Water A Flower Day 
If it hadn’t been for coffee, cocoa, vanilla, lavender, camomile, marijuana, and many other flowering plants and trees, our world would have been a barren, dismal place. So Water a Flower Day is that yearly reminder to show our flowers how much we appreciate them for their sumptuous colours, their fragrant blossoms and their medicinal, or sometimes lethal, properties.
The best way to celebrate Water a Flower Day is by giving all of your household and garden plants an aquatic treat. Also, studies show that gently caressing them in the way that a diaphanous zephyr would in their natural habitat promotes growth, so don’t be shy, give their leaves a tender squeeze. Unless you own a Rafflesia Arnoldii, the largest flower on the planet, which doesn’t have any leaves and is also known as the ‘corpse flower’ due to the odour it oozes when disturbed. That’s one plant we wouldn’t mind forgetting to water, isn’t it? Best stick to roses and lilies, I say, and water them, stroke and sing to them like you would to a child. You’ll be a better person for it and you’d make the world a brighter, sweeter and more colourful place.
https://www.daysoftheyear.com/days/water-a-flower-day/
http://www.famousbirthdays.com/may30.html