The way you can contribute to bitcoin will depend on the country you are in. In some countries, trying to contribute to bitcoin by running open promotions like hosting conferences or meet-ups can be illegal and by doing so even though you are unaware, you put yourself at risk. In some countries also, trying to include bitcoin payments in your business because you own a business can be just inviting trouble to your business. Know the laws in your country concerning bitcoins, so you do not get arrested in the process of trying to contribute to bitcoin.