The following response has just been sent out to petition signatories. In answer to questions about attending, any member of the public can attend and I’d encourage it. Details are here on Facebook. 
Our Petition Scheme allows the petition organiser (Mr Chris Ward)to address the Council meeting for up to five minutes on the subject matter of the petition, after which councillors may ask Mr Ward any questions and then debate the subject matter of the petition. After the debate and before a final decision is taken in response to the petition, Mr Ward will be granted a right of reply for a further period of up to five minutes. The Council will then take a vote on a proposed response.
A further message will be posted online following the Council meeting setting out the agreed response to this e-petition.
John Armstrong
Legal and Democratic Services
Petition information – http://petitions.guildford.gov.uk/marriageequality/
Out of interest does your MP support equal marriage? is it Anne Milton? There’s a website on C4EM http://www.c4em.org.uk/support-for-equal-marriage/ which shows the supported and she doesn’t yet appear to be one of them?
I’m meeting with her on 5th July to discuss it.