Hypothesis coordinated a number of live and virtual activities to engage people with collaborative annotation in teaching and learning in conjunction with OLC Innovate 2019, an annual gathering of educators focused on innovation, held 2–5 April 2019. Folks joined our team members Jeremy Dean and Nate Angell at #OLCInnovate in Colorado for the AnnotatED summit, presentations, social meetups, and open office hours, and from anywhere online in collaborative annotation on materials related to #OLCInnovate presentation topics. For more, visit our companion blog post.