Not necessarily.
The public health guidelines vary from country to country and from province to province. This many months into the pandemic, we now know that the risk is relatively low outdoors and even lower when people wear masks.
Would it be possible for people to attend an outdoor festival while wearing masks? Would the public health authorities in different jurisdictions here allow it? That's a question worth asking.
All kinds of innovative options exist. Festival goers don't necessarily have to be packed together like sardines. It is possible to physically distance when the size of the space allows.
We have all seen various solutions being deployed, including drive-ins and the drawing of circles on festival grounds to keep festival goers two metres apart. That kind of thing is possible in a large outdoor venue.