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During the summer months, people's weekends fill up quickly! Send them out at least a month in advance. Once they get the invite and let you know they're coming they won't forget! I wouldn't wait any less, summer weekends fill up quick, I would do it by the at least the 1st of July.
You can always ask certain people to bring a dish, but I wouldn't put that on the invite. Can you talk to his family and your family and friends? I wouldn't ask everyone that you're inviting to bring something, but I would talk to his family and your family and friends to see if they can pitch in and help you. There's nothing wrong in asking his parents and siblings and your family.
Give them a call and ask, and when other people call you to rsvp, when they ask if they can bring anything, that's your chance! Ask them if they mind bringing something, just make sure you keep track of who's bringing what so you don't have too many of one thing and nothing of something else.
I hope this helps!
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- Thanks so much, very helpful :)