You don't need growth hacks, you need an actual marketing plan. To come up with that you need to figure out your target audience. In the tech world it is common

You don't need growth hacks, you need an actual marketing plan. To come up with that you need to figure out your target audience. In the tech world it is common for companies to market to people who don't actually provide them with revenue. For instance, a typical SaaS company might target developers. Developers rarely have direct say in expenditure. The goal might be to get enough developers interested in a technology that they just get some street cred. The SaaS company then tries to land some big clients with salespeople who say "our adoption rates are huge". The money happens at a much different level than direct from consumer, which is what a ballet company would want. A lot of tech companies spend a huge amount of marketing effort getting people to use something that is FREE. Seems weird, doesn't it? But, what you are probably asking for are some guerilla marketing/free PR/social media tricks. Lots of blogs cover that. Try video. Words about ballet might not be effective getting people in the door. Short looping gifs or <60 sec videos would probably get better engagement on Facebook and Instagram. Skip Twitter and Google AdWords.