What are you trying to purchase?
You are missing something.
For instance, if you are just trying to purchase general entry tickets, under the heading "ticket with scheduled entrance time for individuals", there are 3 buttons.
One button each for weekly, monthly, and three monthly (quarterly).
For August tickets, you would need to either select the monthly or quarterly button, NOT the weekly button.
You can book an "open" ticket or a timed ticket.
An open ticket doesn't have a date on it so can be used at any time. The only condition is you cannot visit the colosseum before 2pm.
A timed ticket is just that, it's time and date specific.
Both tickets give access to the forum and palatine hill as well as the colosseum.
Be sure to use only the official website when booking. Check the weekly, monthly and quarterly options to see what may be available.
You can go for open ticket
ninj43 - sure, the OP *can* buy an open ticket. The OP will have to know that with an open ticket, they are restricted to entry after 2PM. Since the OP stated that their visit will be in August, the OP can purchase timed tickets as well and schedule a morning visit if desired (to try to miss the heat). The OP was simply looking in the wrong place on the official website since she said she couldn't find August tickets.
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