Marvel Studios can finally show Natasha Romanoff's funeral in Iron Man 2. As an original member of the Avengers, her time with the team came to an end in the 2019 Marvel epic. Her and Hawkeye's time travel mission to Vormir ended with Natasha sacrificing her life so the Avengers could get the Soul Stone.
Despite a heroic end to Black Widow's MCU story, Endgame didn't show her funeral. Instead, that moment could come in Black Widow.
Although the majority of Black Widow is confirmed to take place between Iron Maiden (Rachel Weisz), and Red Guardian (David Harbour) being introduced, there's also the opportunity for Black Widow to set up the MCU's future. One such way this could happen is by showing of her Russian family that are still alive after Endgame gathering for Natasha's funeral at the end of the film.
A funeral for Natasha would be a fitting way for Black Widow to end. After Marvel uses an entire film to highlight her in the way many fans have waited to see for years, this ending can The Falcon and The Winter Soldier.
Not only could Natasha's funeral be a great way to bookend Scarlett Johansson's time in the MCU, but it is also a moment that Marvel Studios may never have the chance to do again if not here. Unless more Black Widow films are made as prequels or some with Florence Pugh in the lead happen, there isn't a clear opportunity for Natasha's funeral to be shown. So, that makes this potentially a one-time opportunity that the studio shouldn't up. But now that the Black Widow's release has been postponed, we'll have to wait even longer to find out if Black Widow includes her funeral.