Activists are hoping to keep the momentum alive after a weekend of protest marches and rallies aimed at President Donald Trump.

While last weekend’s marches focused on women’s rights, activists on social media are hoping to use a rally on April 15 to pressure the president into releasing his tax returns.

During the campaign, Trump repeatedly promised to release his returns. However, White House senior adviser Kellyanne Conway said on Sunday that he no longer planned to do so because “people don’t care.”

That inspired the calls for a protest on April 15, which would normally be tax day, but because it falls on a Saturday ― and since Emancipation Day follows ― taxes will actually be due on April 18 this year.

Several people proposed the date on Twitter, and the idea quickly gained steam:

Trump claims no one cares about his taxes. The next mass protest should be on Tax Day to prove him wrong. — Frank Lesser (@sadmonsters) January 22, 2017

@sadmonsters Tax Day March - Saturday, April 15 - see y'all there — Jennifer Arrow (@JenniferArrow) January 22, 2017

I ENDORSE THIS 100%. This is the next march. This is the next demonstration. Please RT, everyone. Every city. https://t.co/lgVLknPnnG — Patton Oswalt (@pattonoswalt) January 23, 2017

Dear #WomensMarch organizers: please organize a #TrumpTaxesMarch for April 15th. I am happy to help. We all are. — Patton Oswalt (@pattonoswalt) January 23, 2017

1. Let's get to work on a Tax Day Protest in DC and at local IRS offices around the country to demand that Trump release his returns.. — Beau Willimon (@BeauWillimon) January 23, 2017

April 15. 'Make Trump Release His Taxes' March. I'll do it. On board. — Carl Newman (@ACNewman) January 23, 2017

Pssst. April 15 is a Saturday, and someone hasn't released his taxes yet. What do you think about marching again? #TrumpTaxesMarch — Tim Eldred (@TimJEldred) January 23, 2017

FANTASTIC idea. And it just so happens April 15 2017 falls on a Saturday. https://t.co/iYQHLbqix5 — Gary Whitta (@garywhitta) January 23, 2017

Saturday, April 15: A "Show Us Your Tax Returns" Trump protest? Great proposal from @jentaub. (Taxes aren't due until April 18 this year.) — Maud Newton (@maudnewton) January 22, 2017

Save the Date - #TrumpTaxesMarch - Saturday, April 15 - The Next Right Thing #TNRT Be #TheResistance — Annie Spell (@Annie_Spell) January 23, 2017

Friends in SoCal (especially OC and SD), who's with me to do a #TrumpTaxesMarch on April 15 as follow up to the #WomensMarch? https://t.co/khAqRPnHL2 — Mike Levin (@MikeLevinCA) January 23, 2017

Dear #WomensMarch organizers, please organize a #TrumpTaxesMarch for April 15. Yes we do care!!! — Mindy Hinkle (@cheesiegirl) January 23, 2017

I am really digging the idea of a Tax Day March. Not just about his returns, but about the refusal to use public funds for the public good. — sarah jesudason (@fledglingnerd) January 23, 2017

Next march: April 15 bc his taxes matter. https://t.co/6yVz4HXqhv — Llama 🇺🇸44 (@Llama_Chameleon) January 23, 2017

When liberals take back tax day from the Tea Party. That will be priceless. https://t.co/1RUY5i18dv — Jason Karsh (@jkarsh) January 23, 2017

This has to happen. https://t.co/JntvdtO4G1 — Christopher Swartout (@chrisswartout) January 22, 2017

See you all on April 15. Same place, different witty posters. https://t.co/ziDUP5UVvj — Eitan Bencuya (@ebencuya) January 23, 2017

It’s not clear if anyone has begun the process of securing permits or if the organizers of the Women’s March will endorse the planned Tax Day events.