A woman in a red long-sleeved shirt and blue jeans stands at the lectern speaking at or about GLAM U WIKI.
A woman is standing at a lectern.
"Stands at the lectern" is a rephrase of "standing at a lectern."
A woman could be in a red long-sleeved shirt and blue jeans.
If the woman stands at the lectern, she is standing at the lectern.