Taco Tuesday is a custom in many US cities of going out to eat tacos on Tuesday nights. Restaurants will often offer special prices, for example, "$1 fish tacos every Tuesday night". It is popular in many big cities across the nation and especially popular in the beach cities of Southern California. Taco Tuesday is similar to Happy Hour in that restaurants vary in their participation, hours, and specials offered.
Legally, "Taco Tuesday" is a trademark of Taco John’s and other restaurants are prohibited from using that term.
References
Taco Tuesday Wikipedia(Text) CC BY-SA