On November 26, 2021, at 17.00 CEST, SEA, the Search Engines Amsterdam meetup returns with two talks. This edition of SEA is focused on learning to rank. Harrie Oosterhuis from Radboud University will kick off with a talk Unifying Online and Counterfactual Learning to Rank. Rolf Jagerman from Google will give the second talk on Bootstrapping Recommendations at Chrome Web Store. Please head over to https://www.meetup.com/SEA-Search-Engines-Amsterdam/events/cnwjfsyccmbgc/ and sign up.