Excuses for parents to go somewhere?

Okay so I need go see my girlfriend tommorow cuz i wont see her for like two weeks after that problem is that my parents won’t let me cuz I already went over house once last week(hardass parents). I’ve already tried getting her mom to call before and that just got me in trouble. And oh i forgot to mention that they dont know that she’s my girlfriend(hardass indian parents). Her brothers birthday is tommorow and he’s a bit younger than me so i used the excuse of going to her brothers b-day and they told me its disgraceful to go to a younger kids b-day. What do I do?