[Answered ]-JQuery/Django Syntax error

If you remove the line marked below it will definitely work.
In a dict of params for ajax you are putting a console.log which is completely wrong.

$.ajax({
            url: "/reserve/",
            type: "POST", //Send the info to reserve view
            data: {
                pk: pk
            },
            dataType: "json",
            console.log('form submitted') <-- remove this line
            success: function (result) {
                if (result.result == 'clear') {
                    $(this).toggleClass("free reserved");
                    $.toast({
                        heading: "Reservation Clear!",
                        icon: 'success',
                        stack: 4,
                        hideAfter: 2000,
                        bgColor: '#003366',
                    });
                };

Note: if you want to debug your code then you can put a beforesend like function from ajax which would help in debug that whatever you are passing or what is your flow of js code.