Informative

Agenda

The running order, and the push notification that fires as each section starts.
Agenda is your running order: titled moments with times and an optional line of description each. Guests read it on the event page.
Each section can also fire a push notification, at its start or a chosen interval before, to everyone who answered your RSVP. That is what makes an agenda more than a printed schedule.
Image
The agenda list with one section expanded and its notification set.
Organizers and co-hosts are excluded from them.
Push only. There is no email version, because a same-day nudge belongs on a lock screen.
Move a section and its reminder moves with it. There is nothing to re-arm and editing one section costs the others nothing.
A reminder running more than ten minutes late does not send at all.
That last one is deliberate: a late "starting in thirty minutes" is worse than silence.