Final answer:
An increase in fixed costs affects the total cost and requires more tickets to be sold to break-even, especially if the event deadlines cannot be changed.
Step-by-step explanation:
In relation to the event break-even chart, an increase in fixed costs such as promotions can affect the total cost of the event. This means that the expenses associated with organizing the event will increase.
Furthermore, when there is an increase in fixed costs, a greater number of tickets must be sold in order to break-even. This is because the total revenue generated from ticket sales needs to cover the higher expenses.
Additionally, if the event deadlines cannot be changed, more tickets must be sold to ensure that the event breaks even. This is because there is a limited timeframe to generate enough revenue to cover the costs.
Therefore, the correct answer is option 4: All of the above.