Bernie Sanders hosted a massive grassroots organizing event on Wednesday evening that featured simultaneous parties in all 50 states, as the upstart Democratic candidate seeks to mobilize the progressive base of the party.

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Sanders appeared at a house party in Southwest Washington, D.C., and made remarks broadcast simultaneously to all the meeting locations in the country, from Alaska to Florida.

“Tonight is a historical night and all of us are making history,” Sanders said at the event, reading his notes from a music stand. “Why are we seeing spontaneous uprisings if you like and meetings in cities and town all over this country? My answer is the American people are saying loudly and clearly, enough is enough.”

During an abbreviated version of his standard stump speech in which the Democratic presidential hopeful pointed to wealth inequality and racial injustice, Sanders also pointed to the massive size of the event he was hosting.

More than 100,000 people had RSVPed to participate in some 3,500 parties in houses, living rooms and coffee shops, Sanders’ campaign said on Wednesday night, making it the biggest online organizing event of the 2016 campaign. The large turnout Wednesday is an important part of Sanders’ plan to build enthusiasm among the Democratic party’s base.