My guess is that you'll be using your Fuji? A 28-105mm works for me. Unless you want a wide shot of a big group of people bunched around the plaque or an exhibit. Not much different from covering my school shoots or most generic events (minus weddings please).
Go capture people in action and whatever they are doing. RCs are usually less fussy about their shots, but you'll definite want to capture shots of the VIP/GoH with the Chairman and so on. Go for the usual clasping-of-hands/handshake pix, and maybe a couple of in-your-face close-ups of the expressions, esp of the VIP.
More importantly, check with the RC if that's allowed. If the VIP/GoH is some Cabinet minister, they'll have to clear you first. Plus the perfunctory equipment/bag checks.
Then easy lor. Follow above post. But do get yourself ready to switch between 200 to 400 ISO quickly. Also recommend you switch to shooting in P mode. Faster, less hassle. Spare yourself the nuisance of tweaking shutter, F, etc. After all, RC isn't gonna care a whit about artistic shots or stuff like that. Just make sure you get a good number of MP/VIP pix. Plus know who else are the "important" people to shoot and get them.