@Elvico_P I'm sorry you weren't able to locate any of the food stalls in Build mode. Just for your reference, here's a screenshot of two of my sims in the Center Park wedding area in San Myshuno's Meadow Park.
You can see the wedding arch to the left of the sims. After placing the food stall in Build mode, one of the sims clicked Hire Vendor and (after a wait) Eric Lewis arrived.
To find the food stalls, enter Build mode and "Center Park Items" will display as the default.
Select "Activities and Skills" then select "Misc." All the food stalls will be available for selection at the very bottom.
Hope this works for you! Sorry my explanation wasn't clear enough last time.
Also want to know if i cant use my stall in the normal festival area...like on a normal day you know.
I'm not sure what you mean by this. You can only place objects in an area of a community venue (or residential lot) where building is allowed.
I don't think the community areas in the San Myshuno residential zones permit building.
@Playalot can you help out with this question? I think I've tried renovating a festival area but was unable to but I've never tried with a building cheat.