The company that runs the popular Boston Winter festival on City Hall Plaza sent a letter reaching out to vendors that participate in the event’s shopping market, amid a dispute with a business partner that has cast a cloud over future festivities.

Boston Garden Development Corp. alerted the 100-plus vendors that the group remains committed to hosting the shopping market again next season, and that “we would like to hear from you on what improvements could be made on past holiday market operations.’’

“You participation and presence contributes to the magic and overall experience of the event, and we greatly appreciate your involvement,’’ said the letter, posted Friday, asking for vendors to send e-mails to bostonseasons@delawarenorth.com.

In a high-profile dispute last week, Boston Garden Development, a subsidiary of Delaware North (which owns and operates TD Garden), ended its business relationship with Millennial Exhibitions, the subcontractor that runs the holiday market portion of Boston Winter, a major draw to the event.

Boston Garden first filed a lawsuit in Superior Court terminating its three-year contract with Millennial, saying the company failed to meet its financial obligations. The lawsuit alleges the company still owes Boston Garden $235,000 from the first year of the contract, in 2016, after Boston Garden had paid hundreds of thousands of dollars in up-front costs. The lawsuit also alleges Millennial still failed to meet the terms of the contract even after the contract was amended multiple times.

Millennial, meanwhile, sent a letter to city officials saying the company was ending the contract on its own, accusing Boston Garden of falsehoods and discriminations, and withholding payments owed to the company.

Millennial also accused Boston Garden of overstating attendance numbers and said nearly half of the 110 vendors this year said they either broke even or lost money.

In recent interviews, festival-goers said they were pleased with the festival, though business vendors quietly grumbled about the management and setup of the event.

Festivities at Boston Winter, which opened Nov. 24, including an ice skating loop and a new beer tent, continue through the end of February, though the holiday market closed as scheduled on Dec. 31. The festivities closed Friday and Saturday this weekend, due to the extreme weather, according to the City Hall Plaza website.

In the letter to vendors, Boston Garden apologized to vendors for the business dispute and for failing to remedy any concerns they had.

“From the very beginning, integrating the small business community was a focal point of our efforts to reinvigorate City Hall Plaza and, with any collaborative event, all parties should have the opportunity to be successful,’’ the letter stated, adding that the group’s questions about Millennial’s “ability and credentials to properly run the market have grown dramatically.’’

“We were equally concerned to hear from many of you recently who voiced your concerns and your disappointment in [Millennial], and that company’s ability to run a successful holiday market that works for you,’’ the letter stated. “For those who have been affected, we are sorry that they let you down and we share your frustration.’’

Milton J. Valencia can be reached at milton.valencia @globe.com.