Here is the non-Sierra Club sponsored events calendar.
The Non-Sierra Club activities, and activities on this calendar, are not sponsored or administered by the Sierra Club. The Sierra Club has no information about the planning of these activities and makes no representations or warranties about the quality, safety, supervision or management of such activities. They are published only as a reader service because they may be of interest to the readers of this publication.
If you move your mouse over a time/event on the calendar, you can click on it and get more details, often maps, and add them to your own calendar.
If you click on the +Google Calendar icon on the bottom right of the calendar you can use the calendar along with your own using google’s calendar function. You will need a google account (free). You can do the same with the non-Sierra Club calendar and overlay the two with your own google calendar.