Most opinions say that haircuts/shaving can start on the morning of Lag BaOmer (it doesn’t have to wait for chatzos).
There are opinions that haircuts/shaving can start from mincha time the afternoon before Lag BaOmer.
Even those keeping second half of sefira can take haircuts on Lag BaOmer.
When Lag BaOmer falls out on Sunday, haircuts are allowed on Friday (some say to wait until after chatzos) and if necessary Thursday night too.
There’s a debate if music/weddings are allowed the night of Lag BaOmer. It’s best to be strict.
Those that have the minhag to make bonfires “hilula” are relying on the opinions that Lag BaOmer is a Yom Tov.
It’s not preferable to say “tonight is Lag BaOmer” before actually counting the Omer on the night of Lag BaOmer.
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