Update: See some photos from Eeyore's 2014 bash below.

Original story (April 25): It doesn’t get much more Austin weird than Eeyore’s Birthday Party – the annual Pease Park bacchanal known for outrageous costumes and booming drum circles.

This Saturday, April 26 is the 50th anniversary of the party. To mark the occasion, KUT News puts down the turkey leg to bring you five things you may not have known about the long-running festival.

It started as a UT thing.

Scott Sexton is the president of the Friends of the Forest foundation, the Austin nonprofit that puts on Eeyore’s birthday. He notes that the first celebration was dreamt up by UT English major Lloyd Birdwell Jr. and his fellow students.

Birdwell died in January at the age of 70. His obituary reads:

A student of English literature, Birdwell selected a theme based on A.A. Milne’s Eeyore character from Winnie-the-Pooh. The gloomy donkey was once especially saddened because he thought his friends had forgotten his birthday. The first Eeyore’s Birthday Party featured colorful costumes, a trash can of lemonade, beer, honey sandwiches, and a live flower-draped donkey. Birdwell wore his magician’s cape and top hat and wielded his wand.

"All the volunteers that knew him, we'll be taking a quiet moment and having a little tribute to him." Sexton says.

It wasn’t always at Pease Park.

Eeyore’s party was initially held in Eastwoods Park – a lot closer to the 40 Acres.

“In the 1970s it grew out of that location,” Sexton says. It was around that time, Sexton says, that “it went from a Friday, ‘let's skip class’ event, to a Saturday, ‘we don’t have to skip class’ event.”

Sexton has passed along a copy of an original invitation to the party at Eastwoods park.

"There will be suitable free beverage, such as beer, for those who think young," it reads. "Also Eeyore's birthday cake, music, special entertainment and a Maypole."

The event gives to charity.

On the Eeyore’s Birthday website, there’s a list of several Austin-area nonprofits. They've all received donations from the Friends of the Forest over the years.

“Once the dust has settled and we find out if we made money or not, then we have a meeting of the board of directors,” Sexton says. After a board vote, “we end up donating money to as many local Austin nonprofits as we can.”

It's planned for the same day every year

"Eeyores Birthday Party is always planned for the last Saturday in April," the Friends of the Forest write on Facebook. "Rain date is the first Saturday in May."

“This year is the 51st celebration,” Sexton says, “which means that this is the 50th anniversary.”

A smoking ban is in effect for all City of Austin parks.

So … be careful with your combustibles.

See Eeyore's Birthday Party 2014 on Flickr