One or two of my colleagues think I pamper my liturgical ministers. A person in an important role in worship should not need a reminder.
But on the sign-up forms, we give them an opportunity to check a box that reads “reminder by e-mail.” The last few minutes at the parish office today were spent sending lector assignments and links on the USCCB Bible page for the appropriate set of readings.
Sit in the purple chair and render judgment. Would your liturgical ministers get reminders? If so, how would you handle it?
Catholic Sensibility 
It strikes me as pampering (and even self-serving for the liturgist) and and may acts as a signal that people are doing you a favor by showing up. People who need reminders can set up their own reminders, and their failure to show up is no calamity (*that’s* an issue where the liturgist needs practice in self-management).
Ahh, hello. We’re talking about lay people whose primary vocation is to serve in the domestic church, right? Reminders aren’t pampering, they’re simply courtesy – and give you an opportunity to engage with your people, and check they’re still ok to serve: if granny has died or one of the kids has an emergency operation or whatever, then showing up to do a reading might easily slip the mind, and in a large parish you might not have heard the details.
In my parish, we don’t do reminders. Instead we just don’t finalise assignments for big events until very close to the date.