Solving
"Can you hear the wavelength?"

Spotify codes = wave (Img1)
23 bars with 0(1 & 23) and 7 (12):
1. shorturl.at/3auyr
Convert to base 10 (A=1, etc) to base 10: 52 12 64 20 25 41 32 61 71 43
Add in 070:
0 5 2 1 2 6 4 2 0 2 5 7 4 1 3 2 6 1 7 1 4 3 0
Copy Paste, scan, enjoy, submit (Img2,3,4)

Congrats Fraser for cracking the puzzle! We'll be sending a free ticket your way shortly. Look out for a write up next week.

A clue for the requests

Find that which is hidden in plain sight. Bletchley will guide you once you’ve made the discovery. While at the park rest under the Ana tree to think about the final solution.
Good luck on your adventure may Droppy protect you.

Don't throw out the I, we need it for next year!

Oh no, droppy just dropped this supercool picture of the con. And this link: events.humanitix.com/crikeycon-ix. How clumsy!