"hey I'm gonna share my live location, I shouldn't be leaving X bar. When I do leave I'll message you"

Then if you're half way across town without a message, something is obviously up.

Also, a lot of phones now will allow discrete SOS messages - my note 20 records 5s audio, front and rear photos and sends live location to 4 people.

So even if you've not prearranged anything, you can still share your location in a pinch - well worth setting it up, especially for a first meet. Hell forget firsts, I still share my location when I go to regular hook-ups. People change 🤷‍♂️