Lauritzen Gardens, the botanical center in Omaha, Neb., is a peaceful retreat in the middle of a bustling city. It’s also home to the Lauritzen Gardens Antique and Garden Show, which will mark its eleventh year, Sept. 19 through 21.

Event chairman Melissa Marvin says the show is a great way to bring together people of all interests and to showcase the beauty of both the gardens and the antiques on display.

“We’ve expanded it and included really something for everybody. ... There’s everything from every price point,” she says.

More than 30 antique dealers will showcase their wares, and guests ranging from curious shoppers to serious collectors are invited to see what the show has to offer. A $15 ticket covers entry to the show for all three days. Students can enter for $10. Additional activities will cost extra, but Ms. Marvin says they’re worth every penny if guests have a special interest in interior design, culinary arts, British history or antique appraisal.

Along with free, twice-daily informational sessions on topics like antique jewelry and caring for antiques, each day of the show will feature a renowned guest speaker. Designer Mary McDonald, star of decorating shows like “Million Dollar Decorators” and “Property Envy,” is Friday’s speaker. Chef Brian O’Malley, instructor at the nationally acclaimed Institute for the Culinary Arts at Metropolitan Community College in Omaha, will give a food demonstration and lunch on Sunday.

The weekend’s star speaker, The Right Honorable Lady Fiona Carnarvon, is Saturday’s featured celebrity. Lady Carnarvon is the eighth and current countess of Highclere Castle, the filming location of the popular PBS series “Downton Abbey.” She has made a career of recounting the castle’s history and sharing the stories that inspired the series. She also has written two books and manages the care of the castle’s grounds and gardens.

“For people who are really into ‘Downton Abbey’ and Anglophiles, this is going to be huge,” Ms. Marvin says. “... She’s so engaging and wonderful and down to earth, and I think people will really like it.”

Lady Carnarvon will give a lecture at 10:30 a.m. Saturday. A reservation-only high tea with the countess will follow in the afternoon, where guests can visit more intimately with her and hear more about her life for an additional ticket price. Ms. Marvin says slots are filling up fast, so those interested should visit to learn more and reserve a spot.

“She definitely will talk about the show and how it relates to the real story,” Ms. Marvin says.

Another special event on Sunday will appease “Antiques Roadshow” fans. “What’s it Worth?,” a reservation-only appraisal clinic beginning at 11 a.m., will allow visitors to bring in small items or pictures of larger items for five- to 10-minute appraisal sessions, which are an additional $15.

For more information about Lauritzen Gardens and the Antique and Garden Show, including a full schedule of events and additional ticket prices, visit the website or call (402) 346-4002.

“We welcome anyone from St. Joseph to come up!” Ms. Marvin says.

Brooke Wilson can be reached at Follow her on Twitter: @SJNPWilson.