Invite in Advance
Make sure that you let the people who are being invited know in advance. This is very important because if you give a short notice, some of those people may not be able to attend the event due to prior engagements.
Choose an appropriate location which will not be crowded on the cookout day and will have enough space for everyone. Make sure that it is a spot that is easy to reach and should have some basic facilities such as washrooms as people will need to use them during the course of the day.
Keep it simple so that you do not have a lot of trouble cooking it. It is best that you have something delicious and not too complicated. Particularly if you are cooking at the location, it will be even harder to make delicate dishes. Burgers, fries, barbecue and the like are easy to make anywhere and are preferred by people in general so those are good choices. Make a menu that works for you and your family and is easy to manage.
Once you prepare the menu, get the supplies you need. These will include food supplies as well as disposable crockery that you will use as well as napkins and sheets for placing the food on. Make sure that you get the ice on the day of the cookout for the soda so that it does not get wasted. You may have to rent tents, tables and chairs if you are planning something elaborate.
Go through all the details and see what work has been done and if any improvements can be made. Make sure that you make necessary adjustments and get the work done properly. You will have loads of fun.