Begin this activity 26 school days before the last day of school. Each day have the students think of the concepts they learned throughout the year that begins with the letter of the day. For example, on the first day of the activity the students will think of all the things they learned throughout the year that begins with the letter A. Some examples might be: addition, antonyms, etc. I like to have the students work on this activity independently first. Then, after some time I allow the students to work with their group. Finally, we share and discuss what everyone put together as a class. As we share, I use it as a great review opportunity. The students will amaze you on how much they remember and what they can think of for each letter!
If you don't want to make the entire booklet for this activity there is a one page A though Z worksheet you could use instead!