group ride..experience rides pls comment..!!

hello every1...been a long time i have posted sumthing here n i've got a reason now...

tomorrow i will be going for my first ever group ride with along with some of the riders from the local motorcycle riders association .... i have never done it before.... it might sound dumb to some of u, but im kinda worried as im a noob to this... also, i havent signed up for a membership yet, its going to be a free trial ride for 2maro and if i like it and they thing im good enough to join them, i will continue..

so i was wondering are there any things i shud be keeping in mind...apart from general common sense while riding and bit of googling abt the do and donts, i thot some insight from you people wud be helpful too... so if u guys have some experience of group rides and gatherings, please feel free to make some comments...
also, is there anything i shud be carrying along with me apart from my gears n bike..!!(this sounds evn more stupid)

bdw, the ride is going to be about 300km (186 miles) in total...and on really steep down hill curvy roads while going and exactly opposite on way back..!!