Seems like morse code. Decoding with a morse code audio decoder gets the following:  
	THE KEY IS HACKTHEPLANET    (spacing unknown)
Search through the forums a little bit for a hint! Check out [https://ghosttown.deadface.io/t/rendezvous-lets-goooooo/127/4](http://) for the encrypted date as a png.  Reverse image solve indicates it's an *HIBC PAS Codablock-F barcode.*  After lots of searching, I finally found this site: [https://products.aspose.app/barcode/recognize#/recognized](http://)  Decrypts the barcode as YEOOFIIGEHRJBMTJYYUSKPMOIK  Decrypt with Vigenere's with HACKTHEPLANET as the key to get REMEMBERTHEFIFTHOFNOVEMBER  
	flag{NOVEMBER-5}