First of all congratulationz natasha…hope all goes well…ok now shahjehan is a marriage hall in multan n its gud…ramada is there…shangrilla also have lawns where they conduct wedding functions n they r guddd…i had my wedding at MGM(multan garrison mess) n it went perfect mashAllah 
they offer their lawns…u can hav a visit n c wat suits u…my catering was done by amir rajputs n they did it veryyy well…meet their head n tell him exactly wat u want…having sessions is imp as it reinforces to them that u ppl actualllyyy WANT a gud function!!!Good Luck!!!