While this is not game breaking it is fun for PVE and PVP. Using the Burning Blossoms you receive from honoring or dishonoring the fires across the game you can get a 3% crit buff. The trick is to apply a flask of your choice, 250 strength, agility, intellect etc. Then go to one of the fires and use the Burning blossom. To get the 3% Crit buff. You will now have both buffs. You must do it in that order. If you choose to use a flask second you will override the Crit buff since its a Battle Elixer Buff.
Steps.
1. Obtain Burning Blossom from Fire Festival quest givers.
2. Locate a Midsummer Fire Festival Bonfire
3. Use flask of choice, Draenic Strength, Agility, Intellect...etc
4. Use Burning Blossom next to the Bonfire to "honor" the event.
5. Carry on to Honor Battleground, or Raid for a 3% increase Critical Strike Chance which stacks with other crit buffs for a 8% increase.
Have fun.
Three screenshots for buffs.
https://i.imgur.com/W28MOUK.jpg (3% crit) Battle elixir should not stack with flasks.
https://i.imgur.com/Vv11yhs.jpg (5% crit monk/mage buff)
https://i.imgur.com/7aOowZg.jpg (Flask Buff)