Did you have a student (or several) miss an important assessment? In the past, I had lists upon lists of students on sticky notes. After tracking them down and asking them when they could make up an important assessment, I had trouble remembering which student was supposed to be where and which assessment they were supposed to be taking.
My solution? A simple list where I could just write down the student's name, the name of the assessment they missed and the day they missed it.
Next, because it's my philosophy that students can only makeup assessments that their absences are excused for, there's a column where I can simply check whether or not the absence was cleared.
After talking with the student, we decide on the makeup date (within a reasonable amount of time) and check the time they'll be making it up.
Voilà. A simple solution!