Or another possibility for meeting delay..."Tilray stockholders who have not already voted, or wish to change their vote, are strongly encouraged to do so." (news release)
So another reason, although dark, is that some Tilray shareholders were very worried about Aphria's results and subsequently complained, wanting to change their vote to no.
This would be a foolish knee-jerk reaction on their parts, however, as the Pandemic is affecting most businesses negatively. It would be cutting off your nose to spite your face. These results and the next Q will be affected somewhat, and then it's smooth sailing from there.