December 10, 1967, bears witness to a moment of royal recognition when H.M. King Bhumibol Adulyadej bestows an honorable award upon Saint Gabriel's College, acknowledging its stature as one of Thailand's premier educational institutions.

February 11, 1969, marks a significant milestone as H.M. King Bhumibol Adulyadej presides over the grand celebration of Saint Gabriel's College's 50th anniversary.

On December 4, 1969, a momentous occasion unfolded as H.M. King Bhumibol Adulyadej bestowed upon Saint Gabriel’s College a prestigious and honorable Award. This recognition celebrated the institution's distinguished status as one of the foremost educational establishments in the Kingdom, reaffirming its commitment to academic excellence and nurturing future generations.

In February 1972, H.M. Queen Ramphaiphanni graces the opening ceremony of an Education Exhibition organized by the Association of Catholic Teachers.

In a heartfelt tribute to maternal love and devotion, H.M. Queen Sirikit presided over the opening ceremony of the "Mother’s Day Project" at De Montfort Auditorium, Saint Gabriel's College.

November 7, 1990, marks the inauguration ceremony of the Coronation Hall MCMLXXXIX at Hua Mak Campus, presided over by H.R.H. Princess Maha Chakri Sirindhorn.

On February 5, 1993, H.R.H. Princess Maha Chakri Sirindhorn inaugurates the Emmanuel Building at Montfort College during its venerable 60th-anniversary celebration.

January 19, 1995, witnesses the inauguration ceremony of the "Queen Tower" at Hua Mak Campus, a project officially launched by H.R.H. Princess Maha Chakri Sirindhorn, along with the establishment of Assumption University's gateway system for internet connectivity.

On March 16, 1995, Assumption University exhibited its commitment to technological progress by presenting H.R.H. Princess Maha Chakri Sirindhorn with the Netra I-5 Computer Set, Router, and all related equipment at Chitralada Palace. This generous contribution facilitated the establishment of internet connectivity and linkage through Assumption University's cutting-edge gateway feature or system, paving the way for enhanced digital access and knowledge dissemination.

On September 20, 1995, H.M. Queen Fabiola of Belgium and H.R.H. Princess Maha Chakri Sirindhorn honor Hua Mak Campus with their distinguished visit.

Assumption University confers the esteemed Honorary Doctorate in Philosophy in Computer Information Systems upon H.R.H. Crown Prince Maha Vajiralongkorn on January 26, 1998, in a ceremony held at the Nontaburi Palace.

In a distinguished moment of international camaraderie, H.M. Queen Fabiola of Belgium and H.R.H. Princess Maha Chakri Sirindhorn graced Hua Mak Campus with their presence, underscoring the University's global appeal and commitment to fostering cultural exchange and understanding.

On July 8, 1999, H.R.H. Princess Soamsawali inaugurates the academic exhibition "The Father of Thai Nation" in honor of the 6th Cycle Anniversary Celebration of His Majesty King Bhumibol Adulyadej, jointly organized by Assumption University and Seacon Management Co., Ltd.

H.R.H. Princess Bajrakitiyabha participates in an "Equestrian Competition" at Suvarnabhumi Campus on February 3, 2001.

On October 20, 2001, the esteemed presence of H.R.H. Princess Soamsawali dignified the opening ceremony of the 13th ASEAN Law Students Conference, themed "Discover the Real World, Discover the Real ASEAN," held at Suvarnabhumi Campus.

On March 12, 2002, H.R.H. Princess Kalayaniwatana presides over the opening ceremony of the 20th anniversary of the "Ruamchit Normklao for Youths Foundation" at Suvarnabhumi Campus.

June 27, 2002, marks the inauguration of the Cathedral of Learning Building at Suvarnabhumi Campus, a momentous event presided over by H.R.H. Princess Maha Chakri Sirindhorn.

Princess Ubol Ratana presides over the opening ceremony of the "Asian Youth Forum" at John XXIII Conference Center, Suvarnabhumi Campus, on May 20, 2003.

H.M. King Bhumibol Adulyadej bestows the Knight Grand Cross (First Class) of the Most Noble Order of the Crown of Thailand upon Rev. Bro. Prathip Martin Komolmas on December 5, 2004.

On October 30, 2007, H.R.H. Princess Soamsawali presides over the opening ceremony of an exhibition celebrating His Majesty the King's 80th Birthday Anniversary at Suvarnabhumi Campus.

Assumption University presents a textbook titled "Song Thum Sathit: Efficiency Economy" to H.R.H. Princess Maha Chakri Sirindhorn on March 2, 2010, at the Dusidalai Hall, Chitralada Palace, Bangkok.

On December 7, 2010, H.R.H. Princess Maha Chakri Sirindhorn graciously inaugurates the new faculty buildings for Montfort Del Rosario School of Architecture and Design, Albert Laurence School of Communication Arts, and the Communication Arts Studio at Assumption University's Suvarnabhumi Campus, as part of the University's 40th Anniversary celebration.

H.R.H. Princess Maha Chakri Sirindhorn presides over the "5th Thai-US Roundtable Meeting" at Suvarnabhumi Campus on March 29, 2011.

On December 7, 2019, H.M. Queen Suthida Bajrasudhabimalalakshana graces Suvarnabhumi Campus with her presence and receives an honorary doctorate.

On June 12, 2023, Assumption University Honored by the Presence of Her Royal Highness Princess Maha Chakri Sirindhorn
In a heartwarming ceremony at Assumption University, Her Royal Highness Princess Maha Chakri Sirindhorn extended her gracious presence to Rev. Bro. Dr. Prathip Martin Komolmas, President Emeritus, and Former Board Committee Member of the Foundation. Despite his wheelchair, Brother Martin's enthusiasm radiated as he eagerly awaited the princess's arrival. The profound moment was marked by not one, but two expressions of delight from Her Royal Highness at reuniting with Rev. Bro. Dr. Prathip.