One suggestion I came across was "Wednesday afternoon at the park," with openinvitations to everyone in your child's class.
我能提出的一个建议是“星期三下午，在公园”，以公开邀请您孩子的同学们。
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In version 7.0.x and prior releases of Lotus Notes, users needed to open unprocessed calendar notices such as meeting invitations or reschedule notices from their inbox in order to respond.
Mr Burda belongs to a controversial group of "open networkers", who accept the majority of invitations to connect, irrespective of whether they know the person or not.