As far as I know, a romantic meeting can be called a "date". They both like each other. But when you meet a person who provide you with a service such as a dentist, doctor, psychologist, lawyer..., it is called an "appointment". And when you meet someone for business, it's called a "meeting". However, if I just meet my friends or a new girlfriend, I can say: "I'm meeting/seeing friends/a new girlfriend. That's OK. "Learning English with Papa Teach Me" on Youtube said that. Both of them are full sentences, but I want a specific noun like "the first date" or "the first gathering" or "the first meeting". Which ones I can use? And if possible, could you explain your advice? Thanks in advance for any helping or advice.
In American English you could say
At our last ...
And you can refer to the meal itself as an occasion:
At our last...
If you don't mind a longer phrase instead of a single noun:
The last time we met or The last time we got together or The last time we saw each other or The last time we had coffee (lunch, dinner, etc).