It's hard to believe, but Citizens Bank Park is celebrating its 20th anniversary season.

The Philadelphia Phillies are celebrating the anniversary with a series of events and promotions during the season.

Events honoring the anniversary will include:

• The Phillies will celebrate the 20th anniversary of the first game at Citizens Bank Park on April 12, exactly 20 years after the inaugural game at the stadium. The inaugural game's starting pitcher, Randy Wolf, will throw out the first pitch.

• The 20th anniversary celebrations will continue on Citizens Businessperson’s Specials (May 8, May 23, June 19 and July 31) and culminate on Toyota Phillies Alumni Day (Aug. 18) with an on-field pregame event.

• Phillies Charities will host a 20th anniversary Online Auction, which will run until April 7. Among the items featured are signed memorabilia from players throughout CBP history including a Chase Utley signed paver from Ashburn Alley, Jim Thome bobblehead and Bryce Harper's home jersey. You can bid at phillies.com/auctions.

Phillies announce opening-day plans

The Phillies open the season at 3:05 p.m. Friday against the Atlanta Braves. The game was supposed to be played on Thursday, but rainy weather forced it to be postponed Here's a look at what's going on at the ballpark that day.

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• All fans attending opening day will receive a Phillies scarf.

• The ceremonial first pitch will be thrown out by Zeke, a 4-year-old Nemours patient from Lewes.

• The national anthem will be sung by Kane Kalas, son of Hall of Fame broadcaster Harry Kalas.

• The pregame fun includes the Budweiser Block Party at the Third Base Plaza. The block party will have photos with Budweiser Clydesdales, 3D chalk art and more outside the Third Base Gate.

The fun doesn't stop after opening day. The rest of the weekend will include:

• On Saturday, fans 15 and older will receive a “The Fightins” T-shirt, and a block party will be held at the Budweiser Batters Eye Bar.

• On Easter Sunday, fans will receive a 2024 schedule magnet.

• On Tuesday, when the Phillies host the Cincinnati Reds, it's Hatfield Phillies Franks BOGO Night. Fans can purchase two hot dogs for the price of one. The promotion replaces the Dollar Dog Night.

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New exclusive fan gear coming to Citizens Bank Park

As the new season starts, there are other new items at Citizens Bank Park. The New Era Phillies Team store will have a variety of exclusive merchandise for sale including a special lineup of merchandise commemorating 20 years of Phillies baseball at Citizens Bank Park. This includes trading pins, pennants, magnets and can coolers.

There is also the biggest assortment of Phanatic swag ever assembled including headwear, apparel and collectibles. Among the Phanatic items are:

• The Phanatic of the Month set has expanded to a year-round collection featuring the Phanatic in all-new poses and costumes.

• Pennants, decals, postcard sets, can coolers, golf accessories, drawstring bags and drinkware for all fans of the Phanatic are available, including the new player on-field New Era Batting Practice Caps — featuring the Phanatic for the first time.

• There's a big lineup of ballpark-exclusive Phillie Phanatic bobbleheads that will debut this summer.

Speaking of bobbleheads, there's a new collection of commemorative bobbleheads highlighting special moments and events. Available early this season are:

• Bryce Harper’s 300th career home run

• Michael Lorenzen’s no-hitter (featuring J.T. Realmuto)

• Brandon Marsh and Bryson Stott's “Splash Brothers” bobbles available early this season.

Coming later this summer will be commemorative bobbleheads for:

• Cole Hamels Retirement Night

• The Phillies vs. Mets London Series

This article originally appeared on Delaware News Journal: Philadelphia Phillies celebrate Citizens Bank Park's 20th anniversary