Kleinblatt is closed on those holidays (2022):

   1st of January New Year’s Day
 15th of April till 23rd of April Pessah (jewish easter)
   4th of June and 6th of June  Shavouoth (jewish pentecost)
 30th of July till 21tst of August yearly holidays
 26th of September till 27th of September Rosh hashana (jewish newyear)
   5th of October Yom kippoer (day of reconciliation)
 10th of October till 11th of October Soekoth (feast of tabernacles)
 17th of October till 18th of October Simchat torah (feast of the bible)