Time Machine!

You open your eyes and see a massive convention space around you. You realize you successfully made it to 2019, and as you look down at the suitcase, the clock seems to still be intact!

Now all that’s left of your quest is to find a program from the festival!

“My system has an error, but I can give you the location of the programs in number form. It’s up to you to translate it into English with this key.”

A series of numbers and a key next to them appear on the computer screen in the suitcase.

23     4     5     15     8     23     18     19

11     4     15     15