So a WhatsApp message about a party was put on the class group thead, invitations to follow. Lots replied on whatsapp to say yes we'd love to come, including me. Couple of weeks go by and no other invitation then a message asking what food choices people want for the kids. Replied to the message along with others. Just realised we never actually had the 'proper' invite and now ultra paranoid that ours was lost / deliberately not sent. Aibu to think that it's ok for us to rock up having only seen the group message?