One way that you can assure the DJ you are hiring would know what to play at a Latin Themed Party is to ask if he, or she has ever played any Latin events before! If they have, ask them for the song list they put together for that party. Different Latin themes (Cuban, Argentinian, Mexican, etc.) will all have different types of songs that are being played, so you want to be sure that the DJ is familiar with whatever type of event you are putting together.

If for some reason all of the DJ’s who typically do Latin themed parties are booked, no worries. A professional DJ should be able to play any party, as long as he has a proper song list, or an idea of what songs he wants to play. If you give your prospective DJ a song list to familiarize himself with, he will have a good idea of what songs to play when. You could even go one step further and rank the songs in order of your favorites, that way the DJ knows which songs are the “bangers.”
Ultimately, the type of party shouldn’t hinder a DJ’s ability to do his job, which is play desirable music and keep the energy flowing. If a DJ is hired to play a Latin themed party it is his responsibility to do his homework and find out what are the most popular Latin songs (modern) and Latin songs from the past. Although, putting a nice song list together for your DJ will ensure that everyone at the party gets to hear their favorite songs and party it up!
If you want to give yourself the highest chance of capturing as many beautiful moments as possible, I think 2 photographers is always a safe bet. Granted, if you are working with a limited budget and can only work with 1 photographer, that is plenty and you will get some awesome shots undoubtedly. BUT ultimately, someone can’t be in two places at once and when one photographer is taking pictures of people on the dance floor, the other can be capturing candid moments around the party.

Next time you are at a wedding look around and notice how many photographers there are. The last wedding I attended I counted 4 different photographers and 2 videographers! The reality is, there are so many beautiful moments unfolding around a wedding, that it is almost impossible for 1 person to capture everything. If you are hosting a large corporate event, or get together, the same ideas would apply. During a wedding, corporate event, or even some larger parties, schedule’s are so fast paced that a single photographer would have a hard time keeping up and being able to be in the right place every time. I would say a wedding is probably the only event you would ever need 4 photographers. If you are hosting a birthday party, graduation, or a simple get together, one photographer would be plenty.
It also depends how many pictures you want to have from your party, wedding, corporate event, etc. It varies how many usable pictures you get from a photographer, but you can typically count on anywhere from 20-50 photos that are framable, top notch pictures. If you want to get this number closer to 100 usable pictures, it is probably a good idea to hire another photographer. If you want to stay safe, and you have the budget for it, I think two photographers are a great starting point for any event, large or small.