Yes, you can input trainings after they have happen. The sooner you get the attendance data into the Registry, the sooner users can use that data for documenting trainings with their employer or in ECE systems.
Once you enter a training and confirm attendance, training attendees will be able to see the training on their Registry Education and Training Report.
For best practices, we recommend that you input training events well in advance of the training, encourage your participants to enroll using the ECE registry, and have attendance confirmed within 7 days after the training (training sponsors agree as part of their responsibilities, to confirm attendance within 30 days).