Events Calendar Things To Do in Mammoth Lakes and the Eastern Sierra CALL AHEAD. LIFE TENDS TO CHANGE. Please use the contact form to submit your event. We’re happy to include it in the events calendar! Listings are free. Tip Jar $ Donation Amount: Any amount appreciated Select Payment Method PayPal Personal Info First Name * Last Name Email Address * Donation Total: $2.00 Tip Jar - Support the Mammoth Letters calendar!