I think I see where you went wrong. You seem to have created a sub-domain (calendars.wiscollectorcar.com) under the DreamHost system, then added a CNAME record under the DNS for that sub-domain, this is not the correct method.
Firstly, you do NOT need to add the sub-domain 'calendars.wiscollectorcar.com' to the DreamHost system, if you have already done so, then remove this sub-domain and wait for it to be fully removed from the system, this can take a while and until the sub-domain is fully removed you will be unable to add the CNAME below.
Once this has been done, add a CNAME record under the DNS of the parent domain (wiscollectorcar.com) with the following settings...
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