Among the many jobs, roles, titles, and positions in the Royal Court of Canterlot there is the title of Stallion-on-Call. They're role is somewhat similar to that of Mare-in-Waiting; although certain jobs are different based on their titles.
The title of Stallion-on-Call or Mare-in-Waiting is usually a long-term, permanent job position. However like many things there are exceptions to this. There cases where a pony will receive a commission for a predetermined amount of time, after which that time the commission automatically expires.
As Princess Luna's Night Court has grown an evolved it has taken a very appearance and tone from her older sister's. A particular difference is that Luna's court has taken on a much more modern and contemporary vibe to it. The Princess of the Moon has found her strongest base of supporters among the younger, and nocturnal active members of the Equestrian culture. Therefore whenever she goes out and it's not in official court capacity she's makes a conscious effort to dress in current fashion for the event.
So here we see the Defenders of Dreams and her Stallion-on-Call for the evening Bass Amperage at the grand opening of a new cabaret in Canterlot. The princess seems to be enjoying a night away from the court. Its a chance wear something different and enjoy the sight of ponies playing in her beautiful night while, and at the same time partake of drinks, food, music, and her company for the evening.
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