It’s a big day for Birkenstock. Today, the German company made its debut on the New York Stock Exchange.

To coincide with the IPO, Birkenstock has launched a series of interactive public green spaces to open on Wednesday, Oct. 11 and Thursday, Oct. 12.

Through “Birkenfields,” the public is invited to explore the brand’s 250-year heritage via a sensory experience. At Birkenfield Meadow, located at Flatiron Plaza, for example, consumer can immerse themselves in the concept of walking as nature intended. At Birkenfield Grove, located at 410 Lafayette Street, guests can check out the brand’s materials up close, featuring its cork and metal buckles, through the act of play. There will also be foot massages at both locations, along with hot chocolate carts by Maman and pretzels by Sigmund’s Pretzels. Exclusive merchandise will be available to purchase, with proceeds benefiting local New York organizations.

In addition, a Birkenfield Biergarten is open now at Other Half Brewing in Williamsburg featuring an array of games and activities.

All experiences are free and open to the public.

Earlier this afternoon, shares of Birkenstock fell 11.5 percent to $40.71 in its first few minutes of trading on the New York Stock Exchange, leaving the company with a market capitalization of $7.6 billion.

Birkenstock’s initial bounce on Wall Street made it the fourth-largest footwear company trading in New York, by market capitalization. The company now sits behind Nike Inc. at nearly $150 billion, Deckers Outdoor Corp. at $13.2 billion and On Holding, which went public last year, at $7.9 billion.