Hi aggie
although the "tong shu" is not out yet, but u can ask them to calculate the date for u, thats how I got my wedding date in Feb. If your wedding date is not confirmed, its very difficult to look for hotel, alternatively u can tell them that u're getting married in May'05 but the date is not confirmed yet. As for your bridal shop, u can't tell them the exact date, just tell them the month that u're getting married, they're very flexible on this.
If you need advise on hotel, I can give u some feedback and forward u some the packages. I called up almost all the possible hotels in Singapore & view about 8 hotel's ballroom
I hope I can be of help to u