No, none of the communities listed on this page are membership groups, so you do not have to commit to coming along every month and can dip in and out, depending on your interest and availability.
NB The Quote Club and Business Bookworms are both small groups with a cohort of regular attendees, so I do always check with them first before agreeing to someone new coming along. This may take a couple of days so please factor this into your thinking when you choose your date to attend.
Network & Grow events are entirely open & flexible – there is no commitment, just come along whenever you spot a title that appeals.