hi Fanny.. personally I feel tat it's not necessary to rent a separate place for ur make up & frens lah...
u'll be there by 5pm.. and if ur frens are there early too, likely is their involve in helping, which means they will either be doing reheasals, or setting up ur recept table.
though I admit tat the changing room at crystal ballrm is small, but it's definitely enuf to serve its purpose as changing rm for the wedding couple. And also consider tat it's near the ballrom, u do not need to walk too far to change and rush back for 2nd march in...
u may also wan to ask Hilltop of ur plan to rent Wine Bar as changing room.. cos u will be escorted thru out the whole nite by one of the banquet mgr.. so it may not be so convinient afterall...
beverages & early dinner of ur choice will be served to u and all whois there early.. for me, I had my early dinner in the changin rm, and my emcess & helpers had theirs at the reception area..
nonetheless, most impt is tat u must be happy.. its ur big day girl.. u make the call