Dear Mr. or Ms.,
I thank you for your efforts. I ask you as a member of the Programme Committee of WikiIndaba 2018 if you allow me to open the call for submissions for this important conference. The call for submissions is already available in https://meta.m.wikimedia.org/wiki/WikiIndaba_conference_2018/Submissions. If you still have any opinions on how to ameliorate the call, you can propose your adjustments and I will do them. If you think that the call is excellent, please answer this email and approve it. Dear Ms. Isla, I tried to reach you several times this week. However, I did not have any answer. Please confirm if the call for submissions is excellent now.
Yours Sincerely,
Houcemeddine Turki