When trying to find a time any group of people can meet, there are two ways people express their available times. They can say “I’m free from 6-8 and then after 9″ or they can say “I have a meeting from 8-9.” For some reason it urges me whenever someone answers in the latter, by telling the group when they aren’t free. As soon as the group is more than, say, four people, it starts taking a lot of effort to read through responses and say “ok, he’s free at six, she’s free at six as well — oh no, she’s not free then…”
It also just doesn’t make sense to me. We’re a group of people trying to see when we can meet, why would someone tell us when they can’t? Sometimes I’ve found that when organizing a group to meet for a project, people will like to mention why they can’t meet at a certain time to show that it is for a legitimate reason, such as “I have a meeting from 6-7.” I don’t care for this. There are a few situations in which it wouldn’t bother me. For example if someone is doing something really cool that they want to share with the group, or if they are also inviting people in the group to the event. But otherwise I trust my group members to put effort forth into projects, and if they say they can’t meet, I’m not going to question the legitimacy of their unavailability.