Also, keep in mind that I am giving you general principles. You might run into a lively group sometime. Just don't expect it. Many consider brunch to be the best speaking time of day to expect a responsive audience. It is late enough that the folks who sleep late are now awake, but not so late in the day that early risers are starting to get tired.
Lunch is generally a time for good response for the same reasons as brunch.
In the afternoon people are starting to get tired. Audience members will retain less because they are not listening as closely as they did in the morning. You can use more humorous speaking and less hard information, but don't expect laughter to be as intense. The last speaker of a long afternoon or evening program should not expect a great response, again because folks are too worn out. Keep your presentation short and crisp and acknowledge the lateness so that the audience knows you care about them.