Check this site http://www.socalmuseums.org/free/
While this year's annual Free Museum Day has passed, NHMLA has a number of free days and hours of operation! Please visit our official site for more details: https://nhm.org/site/plan-your-visit
There are various offers if u wanted to check there website
From the website Receive free Museum admission the first Tuesdays of every month (except July and August) and free Museum admission every Tuesday in September. We recommend reserving tickets in advance to guarantee Museum entry and to skip the line, because of high attendance on these days. We offer free Museum admission daily to: CA EBT cardholders with ID CA teachers with ID Active or retired military with ID Children 2 and under *Free Museum admission does not include specialty ticketed items. Free hours for L.A. County residents L.A. County residents receive free Museum admission Monday through Friday from 3 - 5 pm. Bring a valid ID or utility bill the day of your visit.
Thanks! Your answer is awaiting moderation.