Foremost, my biggest feeling about this piece is that it feels swolen. Like mentioned by a previous critiquer, sentences such as

her diamond ring shimmering over the crowd become so saturated that they lose their effectiveness and only serve to truncate the flow of your story.

She made a mental note to berate her technicians later. I fail to see how this phrase fits. You say she is livid, in the middle of a massive rally speech, yet this seems both compassionate and irrelevant to the plot. It contradicts the kind of stereotype you're trying to portray and does nothing for the immediate story. She lamented over the choice to make this conference an outdoor event. Her docile expression did not reflect her anger. Also seems unecessary. We already have a fairly clear picture of the setting, her emotional state and her demeanor towards the crowd. I want to thank you for joining me here today in this summer heat to show your support for those in need.” I feel like this phrase could be used earlier in Charlie's speech. It helps us visualize the setting and enhances immersion effectively, and because of that, carries more value if placed within the first few sentences. As it is, it's not bad, but I can't help feeling it could be better if used elsewhere. As With a snarl, she shoved the doors open and stepped into her company. ...and stepped into the building. Using a company as a physical location is very coloquial and reads very awkwardly. “Well done.” Charlie didn’t recognize the voice, but she couldn’t be bothered to find out who it was. “In the future, we’re doing these inside,” she complained. “And we’re cutting the length in half. Lastly, I’ll give my speech at the beginning, not the end.” This is not effective. Instead, a better way of showcasing how deeply annoyed she is at the whole situation, you could spread those thoughts throughout the piece. You don't even need all 3, as it might end up being overexposure. And introducing an irrelevant characters only makes the story more confusing. While reading, your reader is eager to find out her true intentions with Project Persist, and this person who says "Well Done" just acts as a meaningless obstacle in that, seeing as she immediately get into the dialogue with the CFO. It sets up a small scene that never delivers, while not advancing character development or even composing the new environment.