A "time slot" (slot) is a date and time on your schedule.
For example, many people have their lunch time slot between 12:00 and 1:00 in the afternoon.When Shawn says he wants a time slot that is convenient (convenient), he means easily fitting into one's schedule or other activities, or not creating problems by conflicting with another plan or activity that you have.
You want something so that everyone can "make it" to the meeting - everyone can go to the meeting.It should be at a convenient time that people are able to actually go.
Shawn is saying that if the time slot, or date and time, when they are meeting currently is convenient for everyone, or easily fitting into everyone's schedule, then he thinks they should meet at the same time every Tuesday for the next two months.Shawn says that at this point, two month from now, the group can reevaluate the situation and determine whether it would like to continue with the meetings.
"To reevaluate" (reevaluate) means to look at something again - to evaluate it again, to reconsider, or to think about something again and decide whether you like it or don't like it, whether it is good or bad.You might, for example, reevaluate your decision to buy a new car - you'll think about it again to see if it really is a good idea.
"To determine" means to decide something or to know something for sure.For example, you might determine, or decide, this isn't the best time to buy a new car and that you should wait until next year.
Shawn is saying that two months from now the group can reevaluate, or look at again, its meeting schedule and determine, or decide, whether it wants to continue meeting every Tuesday.Shawn has ended the discussion, from the previous lesson, and is helping the group plan for the future, or decide what will happen once this meeting has ended.