Very Pissed Off.

I'm very pissed off and disappointed with what happened just yesterday morning. I'll just give the facts I've got:

• I was informed by my boss about the event Saturday, July 21 around 4 AM. My boss' boss informed me of the event Saturday, July 21 around 1 AM. Both informed me that the schedule is Sunday, 10 AM.
• I have provided my contact information as soon as my boss's boss had informed me. She said it is so that they could contact me and inform me about the event.
• So that I will not be late, I texted the number of the POC (Point of Contact) at around 10 AM of Saturday so that I will not miss the event.
• POC replied to me 1:54 PM, Saturday July 21, saying "Txt u the details later..."
• So, as instructed, I went to the event on the scheduled date, and no one was there. I texted the POC again, and the POC informed me that the schedule was actually SATURDAY, 10 AM.

Now, these are my questions:

• If the schedule really was SATURDAY, 10 AM, then why did you reply to me at 1:54 PM saying that you will text me the details later?
• Why was there a discrepancy with the schedules? Two bosses (and I was also following the thread) said that it was a Sunday.
• You argued that it was consolidated to the members. You have my contact number, so why was it not cascaded?

This is very infuriating and disappointing. I have filed a complaint about this, and this puts the integrity of the people I am forced to work with on a very low standing.