Past years there have been a Blizzcon App with the schedule, and you could mark what you wanted to see with an alarm to let you know it’s time. Is the App going to be updated for 2026?
There will not be a dedicated app for BlizzCon 2026.
But the BlizzCon website is built with mobile in mind, so you can pull that up on your phone to view the schedule and map. In fact, I’d recommend downloading the map on your phone ahead of time 
And if there are any panels you’re interested in reminders for, put them on your calendar.
Thanks for this clarification