Is this a phrase?

My guess would be it means, “Hurry up and buy your ticket, because this is going to be an exclusive event and only those who get their ticket early will be able to experience this interactive opportunity.”

@lessonenglish An “Intimate setting” means limited space and seating and “foster dialogue” means they’d like people to discuss.

@SpatzieLover : It may also be “Maintain an intimate setting:” keep the discussion personal. (This is more difficult with a large group.) “Foster dialogue:” encourage discussion.. I am not sure just saw the words in the dictionary and arranged them.

Yes, it does mean that. “Intimate setting” generally is used to mean “keep it small” that’s why the words “limited seating” were used.

The sentence means that there are few places available so that the discussions are personal (an intimate setting) and so people can talk to each other about the issues (foster dialogue).

Generally the phrase used is that “we have limited seating”, which means that “seating capacity is limited”. “Limited seats” is a misuse. Should I infer that the seats are missing cushions, a leg or two, a back?

The second sentence should be clear. The “limited seating” is by design, in order to avoid having a huge crowd and no way for the various members of “the crowd” to interact with each other.

Seeing the parallel structure of this sentence will help. The sentence is grammatically correct, and the omission of the second “to” is legal, but for clarity I am spelling it out.

Attendance is limited to maintain an intimate setting and to foster dialogue among all participants.

Restated:

Attendance is limited = We are keeping the attendance low, or small

I don’t like this use of “limited,” although it is very common. In reality anything that isn’t infinite is limited, and the limit may be very high. They could limit the attendance to one million and it would still technically be limited. But people use it to mean that there’s a low limit—that is, not many can attend.

to maintain an intimate setting = in order to maintain (for the purpose of maintaining) a feeling of closeness (Intimate, sense 4) among the participants so they will feel comfortable speaking in the group (setting, sense 2)

and to foster dialogue among all participants. = and in order to encourage (foster, sense 1) speech and discussion among all those who attend.