I've been pondering this recently as I sometimes read members posting about their "small" weddings of 100 or more guests. I'd be curious to hear everyone's opinions are on what their total guest count definitions are for: extra small, small, medium, large, extra-large, and finally what I'd personally call "event" sized weddings. (I've also added elopements in as well, just because I see so many people or even venues get this one totally wrong.)
To start, here are my own (rough) definitions:
Elopement: 3 or fewer (officiant and up to 2 legal witnesses, in some states. Arguably an officiant may or may not be considered a "guest" by some in which case this would be only 2)
Extra Small / Intimate Wedding: 4 - 20 (I didn't choose 20 arbitrarily but because most restaurants won't let you make reservations for more than 22 so after adding in the couple you've reached your limit for an informal lunch/dinner wedding reception)
(continued in comments) -ETA for typo and title*