Im worried that if i miss this one thing my spot'll b taken out?

i have my own click i guess. me and a other girl basically lead our group (though we r not really competitive between ourselves). the other girl is having a small party this weekend where all the girls from our groupie are invited. (4-7 pple are coming) i was invited but i cant go :( im worried that if i dont go then i'll miss out on everything that happens. i mean its gonna b a hell of a fun time apparently. what shud i do? and what do u think'll happen 2 me and my spot?