50th Birthday Party

I`m throwing a 50th b`day party for my significant other and 18 of her friends in great upscale restaurant. They have a piano as well.

She`s a lot of fun and I want this party to festive, silly, filled with laughter....like her! I`m nervous about it being boring; she`d die!...Sure, I`ll bring balloons, cool party hats (if I could find them) party favors, and I`d like to give everyone a 50th theme take away gift.

I want the party to keep moving....perhaps a roast; she`s a ham and would love that....but how?????

If anyone has any clever ideas for a fun, smart, chic group of people. It`s 9/14 and all I`ve done is send the invitation.

Thank you in advance for your expertise!