The meeting is meant to be pretty informal, so definite timings aren't really possible to give.Do you have definite timings for the afternoon?
For example, one of the first items will be Ashley Palmier's welcome + introduction to the Ventura zoo. But just how long it takes will partly depend on whether those attending have many questions for him to answer (or not). Even the weather will play a part: obviously, if it's raining heavily, folk aren't going to want to spend much time outdoors...
(Probably not very helpful, but what can I say? Just get there as soon as you can, bro'