I would do one of two things, I would try talking to the girls parents and see if you get to talking and they invite you over for that stuff, or I think my HS boyfriend's mother who I saw almost every day said you better come back here for pictures!! She really liked me and felt bad becasue my parents in effect kicked me out of the house (Me: You mean you want me to pay you rent to verbally abuse me? Them: Yep, $250.00 as soon as you turn 18 even if you are in HS. Me: Buh Bye) So she tried to be motherly toward me and I did not hesitate to go back there for pics when asked.
I forgot- I went to two proms that year one with my best friends and it was assumed that we would go to all the houses for pictures. My friend's boyfriend of five years just said " hey can we go back to my house so my mom can get some pics, she wants to see Tonya's dress". So if you trust him not to get embarrassed you could just ask him to be sure to come back, though I was flattered as a girl to have my boyfriend's mom make a fuss over me and ask me to come take pictures. I may be colored by my non family life at the time, read I was desperate to be loved, by anybody!