The free version is free forever but may contain email banner adverts (relevant for an audience of school parents). There is also a limit of 3 published upcoming events, and 100 members. If this is sufficient for your needs, you can stay on the free version for as long as you like.
However, if you like to plan the year ahead, using PTAsocial as a community hub, communication and volunteering tool for your whole school, and benefit from cheaper online ticket transactions PLUS launch a beautiful new public-facing website for your PTA, get in touch with us here at firstname.lastname@example.org. More exciting benefits and members-only perks are on their way too :)