First of all, you have to determine the venue for the Mexican fiesta party. For that purpose, you certainly can organise it indoors right at your home. However, if you really want your guests to enjoy, then you should consider choosing an outdoor venue. You can organise it in your lawn, or can consider booking one, if you have the requisite budget.
Now choose the menu for your Mexican fiesta party. Some of the most popular Mexican foods that people like to list in their menus for such parties include tacos, nachos, burritos, quesadillas, flautas and chimichangas. When it comes to sauces, nothing can be better than to serve mole and salsa in front of your guests. Here, you should always try to choose the dishes that you can make in large quantities for your guests to share.
Once you are done with choosing the menu for the party, do not forget to add tequila and margaritas into your beverage list. Both are traditional Mexican poisons and it is for sure that your guests will love to have them in the party.
Do not forget to decorate your party space. For that purpose, you can hand festive Mexican sombreros in different colours of your choice, preferably red, warm yellow and green. You can also consider using colourful tablecloths and serve food paper plates/cups in multiple colours.
Once you are done with everything and still feel something is missing, then you are absolutely right. A Mexican fiesta party cannot complete without Mexican music, such as ranchera and mariachi. Play the music at the fiesta to complete the mood of the party.