Do you need them to actually sign it or would a checklist work? One thing that I do is make a "to do list" for attendance. Make a list of all your participants, select them, and hit control 1. I don't have a tablet but on my phone I can tap the box next to their name and it checks them off. You can save the list for your records as a pdf.
Not sure if this is what you wanted or not...
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