sentence2: It will start in the 1st of May - which is the starting date of the campaign, and in case any of the participants was not able to write a new post one day, he can compensate by writing an extra post the following day.
sentence1: وفي حالة إن لم تسمح ظروف المدون في يوم بعينه فيتعين عليه أن يكتب تدوينة زائدة في اليوم التالي.