First rule. Make them know you're here. That way, how could they think you were doing something else?
Her mantra repeating in her mind, the Halfling woman weaves through the crowd, making sure to cause a fuss. A push here, a trip there, just to make people notice her. Some turned around angrily, caught a glimpse of the purple-shawled woman, and then she was gone. A fleeting appearance, certainly. Nothing that'd cause too much of a fuss, or make her stand out inordinately.
But it was enough. Now, if pressed, there'd be people who remembered the woman in a jangling, beaded shawl, and each of their stories would corroborate.
Now, she'd made it clear that she was there.
Next step?
Not being there at all.
There. Put in an appearance. That way, there'll be an alibi for me to fall back on.
Barely noticed, Peg slinks out of the crowd.
Spoiler
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Hide: (1d20+8)[12]
Move Silently: (1d20+9)[22]