Limit purchaser to __ total tickets: The total number of tickets the patron will have on the pass. If the pass comes with 8 tickets, regardless of how they can be used, insert 8 here.
Limit purchaser to __ events: The number of different events the pass can be used on. Maybe you have 5 different events eligible with the pass but want to limit them to only using their 8 tickets on 4 out of the five events. (This is a less common limit)
Limit purchaser to __ tickets per event: The number of tickets from the total that can be used on each event. If they have eight tickets total, you might set a limit of 2 tickets per event so that they can't use all eight tickets on one event.
Limit purchaser to __ tickets per event time: The number of tickets a patron can spend on a particular event time. Maybe you're okay with them spending all 8 tickets on one event but want them to have to spread them out to different event times. (2 on Thursday, 2 on Friday, 2 on Saturday, 2 on Sunday)
Limit purchaser to __ event times per event: Limit how many different showings they can attend with the pass. For instance, you have four different event times for an event but you only want them to be able to redeem tickets to two event times of their choosing.