Can I create a custom link for my campaign?

This must be done outside of GalaBid. The campaign administrator can purchase a vanity URL with a vanity url provider also known as a forwarding URL, which when clicked will forward to your GalaBid campaign URL.  

This allows a custom link to be promoted to potential participants instead of the GalaBid URL.

However, note that when participants are forwarded to GalaBid the GalaBid URL will then be visible.