Conversation so far:
Is Spielberg affiliated with one political party?
Spielberg usually supports U.S.
Democratic Party candidates.
Has he made any films that are political?
President Bill Clinton and worked with the President for the USA Millennium celebrations.
He directed an 18-minute film for the project.
Is there any one cause he is particularly passionate about?
he donated $1 million for relief efforts in Israel during the 2006 Lebanon War.
Is Spielberg personal friends with any political figures?
He has been a close friend of former President Bill Clinton.
Has Spielberg made campaign donations to any political figures?
He donated US$1 million to Priorities USA, a pro-Clinton Super PAC.
Is there anything especially noteworthy about his political beliefs or stance?
Spielberg resigned as a member of the national advisory board of the Boy Scouts of America in 2001 because of his disapproval of the organization's anti-homosexuality stance.
Has Spielberg used his fame in another other way to support a political cause?
Spielberg and his wife offered their support to same-sex marriage by issuing a statement following their donation of $100,000 to the "No on Proposition 8" campaign.
Has Spielberg's Jewish heritage played any part in his political beliefs?
he donated $1 million for relief efforts in Israel during the 2006 Lebanon War.
Do we know if Spielberg voted for Trump or Clinton in the last election?
: )?
Spielberg supported Hillary Clinton for President of the United States in the 2016 election.
Is there anything else to know about Spielberg and his political beliefs?
Spielberg and his wife Kate Capshaw donated $500,000 to the March for Our Lives student demonstration in favor of gun control in the United States.

Question: When did they make that donation?
Self-contained rewrite: When did Speilberg and wife, Kate Capshaw, make a donation to the March for Our Lives?