Hi Christina, when you check someone in on the app at an event it will automatically mark them as attended in your program when you sync with Marketo. You may find this article helpful: Check People into Your Event from Your Tablet - Marketo Docs - Product Docs
Thanks Selene for that!
And what about the No Shows? Do I have to do anything specific to ensure they also get captured? Would you happen to know?
Many thanks for assistance.