Yes, these meetings are eligible for PDUs, but the PDUs must be self-reported. Please see the article on How to Claim PDUs for specific instructions
WARNING: Make sure you sign the attendance sheet and get a copy for your records when it is posted on the group site so that you can prove you attended in case of an audit! Keep a folder of all activity documentation.
The following tips come from PMI. Bear in mind that if you attend a 1 hour Roundtable you are only entitled to 1 PDU and are still subject to any maximums required by PMI.