Many conferences and workshops provide participants with a certificate of attendance and this would be sufficient verification. For organized events that do not provide such certification, a record of your registration or payment will suffice. For other activities where formal documentation is not provided, like case rounds, self-guided learning, time spent conducting research or observing a webinar with a group where individual sign-up is not required, you may simply state that you have participated in the activity and provide a description of the activity including the organization, group, people, publication and/or other resources involved. This sample completed CPD tracking form provides the level of detail suggested.