Ontario indoor gathering limits are 10 people. So there's that.
My personal opinion, not to be misconstrued as telling anyone how to conduct themselves, is that prevailing circumstances and predicted trends would suggest that gatherings like this are not the greatest idea.
I would attend, but under better circumstances than the pandemic situation that we currently find ourselves in.

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BWJM
Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.