"You can't even imagine how much we'd like you guys to be there" - if it's not connected with any specific time interval. "You can't even imagine how much we'd like you guys to have been there" - if you mean "it will be kewl if you guys are there" (or "it would have been kewl if you had been there").
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nai6talking about aIt's a bit different in English than in French!futur evenementa future event
nai6you can't imagine how much we 'd like that you guys be thereYou guys, when speaking to your aunt? That's rather slangy. How about this?