Changing the the “View All Gigs” string requires installing a plugin called Say What, since it’s hard-coded in the theme and can’t be edited in the admin panel.
After you’ve installed Say What, go to Tools → Text changes in your admin panel and add a new entry with the following values:
Original string: View All Gigs
Text domain: promenade
Text context: (leave this one blank)
Replacement string: (enter your replacement)
There are a few other hard-coded strings that can be updated using the same method, however, if you’re wanting to change many of the strings or update the terminology in the admin panel, read How to Change the Gigs Terminology in AudioTheme.