'What were the functions of popular festivals, etc. in Early Modern Europe? And why did the authorities, civil and ecclesiastical seek to control or suppress them?'
In Early Modern Europe festivals were the setting for heroes and their stories, to be celebrated by the populace. They posed a change from their everyday life. In those days people lived in remembrance of one festival and in expectance of the next. Different kinds of festivals were celebrated in different ways. There were festivals that marked an individual occasion and weren't part of the festival calendar, like family festivals such as weddings and christenings. Some took place at the same time every year and were for everyone, like community festivals like the different saints' days. Pilgrimages took place all year round. Annuals festivals like Christmas and Midsummer always took place on the same day every year.
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