The Charlatan is not only open a bit later than a lot of bars on the Drive, but it has some delicious food; there is something here for everyone, and it is very simple North American/European food. There is a patio, and there are many levels in the bar.
If you want to grab a quick drink on a patio (or, just a quick drink), this is a great place to stop by. There's nothing remarkable about The Charlatan except for the prices, and the amount of seating (you won't be waiting for too long), but this makes it stand out on the Drive.
If you're allergic to gluten, be sure to ask the server to ask the kitchen to double check.