Here we are given a simple png file.
So as some of the first checks, I ran string on it
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strings PandeAtTheDisco.png
And found what looks like a base64 encoded string:
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ZmxhZ3thcHBvbHNfYXJlX3Rhc3R5fQ==
So i used the base64 -d command on terminal to decode it and get the flag!
And voila! we get the flag!