Advertising / The Boyfriends — 19 March 1978
A previously unconfirmed Where & When lead now has contemporary press support.
What the contemporary source says
The 4 March 1978 issue of Record Mirror gives The Boyfriends' March tour dates and includes Chelmsford Chancellors Hall, 19 March. This is valuable because it is contemporary to the booking rather than a later retrospective gigography.
The surviving Chancellor Hall research trail separately lists Advertising / The Boyfriends on 19 March 1978. The two sources therefore converge on the date and venue.
How it is classified
19 March 1978 — Advertising / The Boyfriends — Chancellor Hall, Chelmsford
Status: Established secondary evidence. The date is supported by contemporary press and a separate gig chronology. It is not described as ticket-confirmed because no surviving Chelmsford Rocks ticket has been identified for this show.
This is exactly the archive's “preserve first, prove gradually” method: a Where & When lead can be upgraded when reliable evidence turns up, without pretending that every detail has the same strength of proof.