Karen Bliss At the first of Justin Bieber’s three “hometown” concerts on Friday, fans found photocopied signs under their seats at Toronto’s Scotiabank Arena that read “WELCOME HOME” above a simple sketch of the Toronto cityscape. However, few did — instead, the 14,627 fans at the “Justice” tour show, rescheduled from last year, spent most of the show on their feet, screaming when they weren’t singing along, a much more demonstrative way of delivering the same message.The first mask-optional concert at the venue (most did not wear one) — since all restrictions have now been lifted in Ontario even as coronavirus levels in wastewater are on the rise — was like old times, pre-pandemic beer spilling included, lip-pouting selfies, and girls trying to sweet-talk or sneak past security to a closer spot.