If you want to "create" a font feature or a custom typeface for a "Knowledge 2017" brand or event, you can use these free tools:
Developed by Google, Roboto is the gold standard for modern, readable sans-serifs. It shares the mechanical skeleton and friendly curves found in Knowledge2017.
It features clean lines and open apertures.
: A modern grotesque typeface suitable for UI and branding.
The most legitimate source is the original designer or foundry. Search for "Knowledge2017 type foundry." Occasionally, foundries release a single weight of a font for free as a "teaser" to attract customers. If the foundry offers a free trial version, that is the gold standard for safety.