During the event's debut in 2014, the Diagon Alley expansion phase of the Wizarding World of Harry Potter at Universal Studios Florida, which was set to open that same year, was still under construction at the time, raising an expectation of the new area of the theme park among the celebration's attendees.

[1] Many actors from the films have attended the celebration, some in multiple occasions, including: Matthew Lewis (2014, 2016, 2017), James and Oliver Phelps (2014, 2015, 2018), Evanna Lynch (2014–2016), Devon Murray (2014), Mark Williams (2014),[1] Michael Gambon (2015), Robbie Coltrane (2015),[2] Rupert Grint (2016), Bonnie Wright (2016, 2018), Katie Leung (2016),[3] Tom Felton (2017), Jason Isaacs (2017), Warwick Davis (2017),[4] Stanislav Ianevski (2018) and Natalia Tena (2018).

After the passing of Alan Rickman in 2016 and John Hurt in 2017, who played Severus Snape and Garrick Ollivander in the films, respectively, attendees paid tribute to both actors.

After Rickman's passing, attendees gathered in front of Number 12 Grimmauld Place, outside the London area of The Wizarding World of Harry Potter – Diagon Alley, to raise their wands in his memory.

[8] In September 2018, Universal announced A Celebration of Harry Potter would not take place in 2019 as focus shifted towards the construction of Hagrid's Magical Creatures Motorbike Adventure,[9] which at the time was not yet officially named and opened on June 13, 2019.