for big sets, they way to grab their attention is with an opinion opener because it allows everyone to have their say and enable them to get into conversation themselves and enables you to find and isolate your target. but remember that in the first minute of opening you need to inplant your verbal and non-verbal time constraint but also root your opinion. the reason why you need to root and time constraint is because right at the beginning the people will wonder how long will you be, how can we get rid of you. therefore by rooting and time constraint you put them at ease and make them less pressured so that they can concentrate completely on what you have to say. the way to open a group correctly besides the opener is to have high energy, speak load so that everyone can hear you and most importantly before you even enter a set make sure that there is a spot where you make your initial approach so that every can see you and you dont want some people turning their heads around. also make sure that there is a seat so that you can lock into the set and engage them comfortably. but dont be too eager to sit down, grab their attention first and rock your body back and forth so that it looks like your about to leave.
hope that i have helped. happy gaming dude
