Trademarks only apply within classes of goods and services you're a) in business in and b) have registered them in and c) in the countries you've filed applications in.
In fact, in the field of Restaurant Services, two existing usages dating back to 1979 exist - one held by Taco John's everywhere except New Jersey[1] and one held by a hotel only in NJ[2].
And it looks like they're having a court case to see who truly owns Taco Tuesday®.
But none of those Taco Tuesday trademarks would prevent you from selling an app called Taco Tuesday that has nothing to do with food. Or start a clothing brand called Taco Tuesday. Etc. etc.