We are looking to set up a post-event nurture for a series of live events (~50) taking place across the US this quarter. There will be one standard set of nurture emails that all event registrants and attendees should receive. Because we want the event follow up to be timely, leads need to be able to run through the stream at a difference cadence. What is the best way to set up the engagement program and lists? e.g. Would it be one engagement program, one stream, and several nested programs/several smart campaigns? Or could I have one nested program or smart campaign that all the event lists feed into?