This is the 6328th most frequent Russian word.
учреждениям
"Institutions" (dative plural form).
In this sentence, 'учреждениям' is in the dative plural form, used to indicate the direction towards the institutions being toured.
Мы сегодня проводим экскурсию по различным административным учреждениям.
Today we are conducting a tour through various administrative institutions.
Here, 'учреждениям' is used as the recipient in the dative plural form, showing to whom the children gave their drawings.
Дети подарили свои рисунки местным учреждениям.
The children presented their drawings to local institutions.
In this example, 'учреждениям' is in the dative plural form, specifying the entities receiving aid from the city authorities.