Comment by rocket666:
Initially it was understood that Graham Bond/Pete Brown were booked but the gig was cancelled and a replacement band (Sparks?) played. However, (credit to Richard Pearson here) it turns out they just had a problem with their van and so were late but did play the gig after all. The actual Contract is for Thin Lizzy but the contract is dated 2 days after the gig so make of that what you will!