On October 29, 2021, at 17.00CEST, SEA, the Search Engines Amsterdam meetup, return with two talks. This edition of SEA is devoted to dense passage retrieval, with Akari Asai (U. of Washington) and Arnold Overwijk (Microsoft). Please check out, and sign up at the meetup page at https://www.meetup.com/SEA-Search-Engines-Amsterdam/events/cnwjfsyccnbmc/.