When Motorhead headlines, they often have 2 bands opening up for them. Usually the band that plays before Motorhead is fairly well known.
The lineup for at least part of the 1982 tour was a group called Fist opening the show. Afterward Krokus came on (they were getting somewhat popular at the time) and then Motorhead came out afterward.
In 2011 when they headlined they had Valient Thorr, and Clutch opening many of the shows.