There’s a reason there are a few hundred ladybugs in a bag when you purchase them. They don’t like to stay in one area, even with a food source; some don’t survive; and some refuse to go to work, even if presented with a banquet. I think a bunch of mine had other ideas in mind. It’s always fun checking around to see where they might be hiding after being released last evening, scattered over some roses, lavender, Jerusalem sage, and particularly upon a honeysuckle smothered with aphids. For some reason, this is the mother-lode plant for aphids this spring. Perhaps it is offering to serve as the prime bait plant, so as to lure them away from other plants.
While one worker has more than enough aphids to contend with, another two have "other ideas"...
Must be the feel of real spring in the wind! Irresistible to ladybugs who have been squashed together in a mesh bag for weeks. Maybe they decided they needed to generate more troops to contend with more aphids…..hooray!
Lavender is a great place to party....without aphids. Shhh....don't ask!
High Vibe Bounty 
Slackerbugs! This cracks me up. The garden in my new-old home is rotten with aphids.
Ladybugs are crazy! I find them in the strangest areas of my yard, and like yours often not in the garden working.