Dia de Pozole - Jueves Pozolero

Me being a Mexican can definitely answer this question. About clothes, you can wear whatever you feel confortable with. Locals like to have pozole to spend time with familly so you should go casual?. Avoid any kind of expensive acccesories such as collars and other stuff so that you can fit well.
If you like spirits you should try mezcal as Chilapans tend to do. Mezcals is supposed to be drunk before pozole is served on your table.
I personally like pozole blanco as Granny used to cook that.
In the pozoleria they serve pozole with "botana" on the side (some snacks to have with pozole) I add some lemon juice, salt if necessary, oregano and chopped green peppers and white onion to my plate. I like to put "tacos dorados" into the soup so that they get soft, then I add some grains and meat on top of a "tostada" (fried crunchy tortilla) and enjoy.
This might sound weird to you but we Costa Chicans like to have pozole with coffee. by the way you can drink whatever you want, there's no rule on this, horchata might be good.

Hope you haven't gone yet!!

Jovani de la Cruz