"closely attended" is a correct phrase in written English and is typically used to refer to something that has been closely monitored or overseen.
For example, you could say: "The meeting was closely attended by several high-ranking officials."
He closely attended, through patronage, to the health of the Republican Party.
Yet he was closely attended to by both a stenographer and a biographer.
Tailgating in the Grove has been a tradition at Ole Miss since the 1950s, its rituals closely attended to.
She was joking, of course, but thanks to her skills with a lip brush and cosmetics sponge, even her jokes are closely attended.
Five cygnets, closely attended by their mud-stained parents, shuffle about and peck off grass near the lime kilns on the quay.
A sleeping child, closely attended by a small dog, is the most readable image, but others -- barely discernible visages, limbs and biomorphic forms -- float in this anticomposition.
Children learn to more closely attend to their emotions and the body's signals for hunger, satiation, sleep and elimination when they have a secure attachment with a parent who is sensitive and responsive to their needs.
Looking forward, investors should closely attend to what stocks lead the new charge, as these will be the ones to make further new multi-year highs.
This might be due to female canaries closely attending to the vocalizations of male suitors during the breeding season, to help in selecting an appropriate mate.
First, both males and females invest substantially in individual mating episodes, and thus must closely attend to the costs and benefits of mating under different environmental circumstances.
In both factories there are workers closely attending the hoppers, hullers, graders, gravity tables and bulking machines.
