I'll post this here even though its in NZ so will have different rules (unless you too are from NZ).
Here, notionally, rules re photography on public land are clear and very unrestrictive. In practice, event organisers may seek to limit your rights and police may assist them even when points of uncertainty are clearly explained to them. Here is what happened to me recently:
In NZ one can take photos in a public place of about anything. At the limits there is obvious overlap with other laws and rights but generally you are largely allowed to take photos of things that can be seen. This to some extend extends onto private property - eg photos of the front of a house or a garden would be OK or even people standing in front of a house but you may not freely photograph scenes which may reasonably be considered to be private such as through windows. I have no problems with the law and am pleased at its relative openness compared to many other places
The P-----a festival is a large annual even held at "Western Springs Lake" - a large Auckland Public Park - replete with lake, swans/ducks/geese, winding paths, bush, bridges, .... . A popular family spot which many visit all year round. The festival spreads across most of this area for 2 days over a weekend. Admission is free. There are NO tickets, NO boundary signs etc, NO regulations or rules posted (AFAIK). There are paid for stalls selling food and theme related services and products (clothing, jewelry, ethnic stuff, ...). There are stages with dancing acts music bands ... . Again, it's all free & fun.
The area is not in any way access-limited. People can and do come to the lake and park to do what they usually do there independent of the festival. There is absolutely no indication or suggestion that it is not 'recreational) business as usual' for those who just want to use the park. They walk, jog, cycle, picnic, walk dogs, juggle (1 seen), sleep, ... . If I wish I can go there and take photos. I can give people contact details for photos online. I could probably legitimately do so for $ BUT I can certainly could do so for free with no objection or legal restriction.
I take photos at MANY events, shows etc. Some free, some entry charged. VERY occasionally I am paid to do so but usually I do so "for fun". I usually hand out contact slips to tell people where to find photos. I get some follow on contacts. I do not recall ever getting any paid photography work that way - that is not the aim or expectation. (The only way I ever get paid work is by word of mouth - this is (obviously) not my "day job :-). Some of the referrals MAY have come from somebody who saw me in a park somewhere but I don'd recall this happening. Usually it's via weddings, parties etc.
I have taken photos at P---- on many past occasions. I have handed out slips at all of them without problems. The security staff and organisers and clean up people and ambulance staff etc are all part of my photos and get slips if wanted. This time I took photos of two smiling security ladies and the fun began. Before long we had 6 organisers. I suggested they invite the police (always present) to comment. Afterwards they would not admit that it was my suggestion. Organisers (a contracted firm) claimed I was ambush advertising etc. They claimed it was unfair to the other paid stands - who I was meant to be 'ambushing' I know not - NO photos were being sold that I was aware of. They identified the bottom line on my handout as the problem. I cut it off. They of course just changed their claims.
This was a PUBLIC place. Anyone could do anything they always did there and people were doing so. I was threatened with
being "trespassed" (by the police) = leave or die. I was threatened with being arrested - "trying my luck with the courts" was specifically mentioned by the police. After a while people denied it was a public place. They would not believe anything I told them - all of which was true.
They next said my email address demonstrated commercial action - it is chosen to be rememberable - NZphotosNZ@gmail.com <- auto replies with list of webpages for events etc.
They poisoned an international good will group against me so I was subsequently assaulted (technically only)(young men 1/3 my age playing chest to chest pushy aggro games and yelling and gesticulating)(police etc then not there) by its members who had previously been pleasant and welcoming. I was harassed by organisers subsequently and they "warned" several stand holders against me. I don't know what was said but friendliness instantly changed to fear !
Alas this has to be pursued by me on principal. Anon.
In NZ it is legal to record a conversation as long as at least one party agrees to the recording being made. A photographer carrying multiple modern cameras usually has multiple recording devices to hand. .... .