I have 3 kids and I work full time. If I have a big presentation I need to give it. I can’t switch things for hundreds of people at my job because of my own personal schedule conflicts. At this age for my kids there are a million school events, I will make it to some and not others. I will call my mom friends and make sure that if they will be there they can be there for my child as well and take a video/pictures to share. If the event is a once in a lifetime event or they absolutely need me there I will make it happen.
If I can reschedule the presentation then I will. I work in tech for a train company. If I do a presentation at 2pm rather than 10am no one dies!
If rescheduling the presentation is possible, I'm 1000% going to do it because my kids come first over anything.