I've made an alert page for when the BTC-ZEN market will open on Bittrex, if anyone needs it:

https://pexbit.com/trexx/

Just leave the page open in a new window and make sure it's not minimized and active.
It checks for the market on Bittrex and refreshes every 10 seconds.

Once the ZEN market is live, it will play an alert sound, so keep your speakers close