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Hi

Please help me with the queries below. Thank you.

1: Is one supposed to use "have" instead of "has" after "may"? e.g. May everyone has good time. / May everyone have good time.

2: What does "Here's to" mean? "Here’s to hoping, just don’t leave the outcome up to everyone else."
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Jackson66121: Is one supposed to use "have" instead of "has" after "may"? e.g. May everyone has good time. / May everyone have good time.
Yes. You are right.

Jackson66122: What does "Here's to" mean? "Here’s to hoping, just don’t leave the outcome up to everyone else
Here's to XXX is a toast - where everyone gets together in a bar, raises a drink and celebrates an event, honors someone's success, or wishes for something to happen.
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AnonymousThis one is correct: May everyone have a good time. "
Tiny correction -- your eye probably glossed over it with your focus on the verb.
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Comments  
This one is correct: May everyone have good time.

"here's to" is a common expression used in the following meanings:

to express good wishes for someone,

to say you are pleased about something, etc., before you drink something as in a toast,

used for making a toast to someone or something
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