There are a lot of different companies on blockchain conference and be a sponsor on it is a good way to attract attention of the blockchain companies to the product and its advantages.
It is a good opportunity to share the experience with other companies and get more new and useful experience and knowledge.
Visiting different conferences is very popular among cryptocurrency projects. It is a good way to attract attention to the project and make it better.
Also it allows to exchange experience and get more knowledge.
That is why blockchain conferences so popular especialy a big one.