They participated in several events held by KRCBS and hosted a blood donation event while promoting Fun To The World. In February 2018, Momoland was designated as the new Korean Red Cross Blood Services ambassador. On May 20, 2017, Momoland participated in the "Plan Art Market to Help Children in the Global Village" as ambassadors of Plan Korea, that was held to support the children of Cambodia. On December 7, 2016, Momoland visited Seoul University Children Hospital to participate in the Pop Culture Artists Talent Donation Event, where about 100 young patients spent time with Momoland and others. In addition, the group had a cultural exchange event to villagers and Korean-Vietnamese culture and showed good response to the villagers by showing their songs on their debut album They volunteered to fly to the Pak Luong Village in Taipei, Vietnam, to encourage Happy Mov students to participate in Kindergarten construction service. On October 26, 2016, Momoland was appointed as ambassadors for the International Relief Development NGO Plan Korea. South Korean singer Psy participated as a lyricist on the song. On November 17, 2020, the third single album Ready or Not, with the lead single of the same name was released. On June 29, 2020, MLD Entertainment announced that the group have signed a contract with ICM Partners with plans to enter into the American market. On June 11, 2020, Starry Night, a non-promoted "special" EP was released, with the lead single of the same name. 2020–present: Starry Night, international expansion and Ready or Not On May 13, 2020, it was announced that Daisy had left the group. MLD Entertainment denied the claims, and stated they would be taking legal action against Daisy. She claimed that after her elimination, she was contacted by the agency with an offer to join the group. In January 2020, Daisy stated that the show Finding Momoland was fraudulent and had deceived viewers by manipulating the votes.
On December 30, 2019, the group's second single album Thumbs Up was released, with the lead single of the same name.
In November 2019, MLD Entertainment announced the departure of Yeonwoo and Taeha from the group, and stated that they were in discussions with Daisy about her future in the group. On October 4, 2019, the group and MLD Entertainment signed a co-management agreement with the Philippine media company ABS-CBN Corporation. On September 4, 2019, the group released their first Japanese studio album, Chiri Chiri without members Daisy, Taeha and Yeonwoo. The single marked their first release without Daisy and Taeha since Fun to the World. On March 20, 2019, Momoland released their fifth EP Show Me, with the lead single " I'm So Hot". 2019–2020: Show Me, Chiri Chiri, Thumbs Up and line-up changes On August 9, 2018, the group became the first girl group and the second act to earn a Platinum certification on Gaon Music Chart, for the streams of "Bboom Bboom". On June 26, 2018, the group's fourth EP Fun to the World was released, with the single " Baam". Momoland at KBS Music Bank in February 2018. 2017: Additional members, Wonderful Love and Freeze! In October 2016, the group were appointed as the PR ambassador for the International Relief Development NGO Plan Korea, volunteered at the Phuc Luong Village in Thai Nguyen, Vietnam from December 12 to 16, 2017, to encourage Happy Mov students to participate in Kindergarten construction service. On December 27, the group except Yeonwoo, who stopped working due to lower back pain, attended SBS Gayo Daejeon. The album was made possible by crowdfunding to cover the cost for producing the physical format. On November 10, their debut extended play Welcome to Momoland was released, and made their debut performance of their single " Jjan! Koong! Kwang!" through music television program M Countdown. The group's debut showcase was held on November 9 of the same year. On October 26, 2016, the group was appointed as ambassadors for the International Relief Development NGO Plan Korea. The Final Mission could not collect 3,000 spectators, and the official debut was delayed. It was decided that the members were going to make their debut. In June 2016, Mnet's survival program Finding Momoland began, a reality show that was created by Duble Kick Entertainment where a group of seven members were selected from ten trainees. History 2016: Finding Momoland and Welcome to Momoland 1.5 2020–present: Starry Night, international expansion and Ready or Not.1.4 2019–2020: Show Me, Chiri Chiri, Thumbs Up and line-up changes.1.2 2017: Additional members, Wonderful Love and Freeze!.1.1 2016: Finding Momoland and Welcome to Momoland.