It appears that Common and Drake crossed paths at the Grammy's, their entourage were both in the VIP section when Common tried to approach Drake to see if there was a problem when one of Drakes body guards came between them to prevent a potential physical altercation.
Dennis Graham who is Drakes father just so happened to be there and had both men come together and resolve their differences like adults, at the end of the conversation Drake and Common give each other a pound and kept it movin....