Yeah. I only meant to speak for myself.
Though the fact that it's a huge and happy event for the kid changes my perspective, though. I'd be upset too if I knew it was that important to him. Especially being the ONLY one left in the dark, on top of that.

Maybe try asking his mother about it but in a playful manner. Like, "So when were you gonna tell me -his name- was on TV, huh?"
If the information was kept from you on purpose though, I doubt you'll get an honest answer that way. But it may be worth a try. There might be a good explanation. Maybe she didn't know that you were unaware.

Good luck.