BBQ bash

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So my Mil and my mom are throwing me a jack and jill BBQ bash! It's going to be my whole family, my SO others family, our close group of friends and our co workers.. We do work together so our co workers list is not so bad.. Trouble is, it's up to 75 ppl!!!! I feel like this is way to many but with such big families and it being men and women I feel like I can't say "oh don't bring your husband, or oh don't bring your wife"

I am overly grateful for this shower! But I don't want people to suffer through my gift opening and I feel tacky asking for a "see through" shower!

Any suggestions?!

ETA: spelling