I only saw Santana in concert once, at a Day on the Green in 1977 that was headlined by Peter Frampton, with Lynyrd Skynrd and The Outlaws also appearing. There were two shows, the second on the 4th of July. I honestly can't remember which one I was at, but here is a bit of Santana's set from July 2, including their Woodstock hit, "Soul Sacrifice":
A 19-year-old Sheila E pops up during "Soul Sacrifice".
There's a story I remember, but I can't find it right now, so maybe it isn't true. Carlos liked the drumming of Graham Lear, but he especially liked how Lear was the spitting image of Michael Shrieve, who played the drum solo at Woodstock. Coulda fooled us out on the Green that afternoon.