Ladybugs swarm because they're looking for a warm place to hibernate for winter. They hibernate in clusters. When one of them finds a suitable place, it releases a pheromone that attracts a couple gazillion more of them. In fact, the pheromone can keep the ladybugs coming back year after year.
References:http://www.uksafari.com/ladybirds_in_winter.htm
https://dengarden.com/gardening/Thousand-of-Good-Luck-Charms-The-Annual-Ladybug-Swarming
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