That depends a lot how practised you are at pretending you're sober when you're not. Apart from tolerance, one gets used to certain states of conciousness, if you've been in a certain state of conciousness (wether it be dissociative, psychedelic or anything else) enough times in enough well variated settings you can much more easily handle those settings and if needed, act sober.
For example, I can act sober on doses of ketamine where I litteraly see the world spinning, but not just once, but in two or three frames that slide over eachother of which one is spinning, one is just sliding around and the third one desperately tries to connect them to a recognisable field of vision, while having the sensation I'm a buzzing blob of cells that has a hard time maintaining balance and moving around and that wíll slide apart, fold double, roll up or be catapulted outside of the universe with my eyes closed (and plenty of odd surreal CEV's that accopany the unsane movements I feel). Well, in that véry dissociated state I can much more easily act sober then I could when I just started doing it and just feeling disorientated and 'generally bizarre', with no buzzing, CEV's etc as the dose wasn't high enough for that. As long as I have enough motorics left to move my mouth into shaping words, enough memory to string together a sentence and enough balance to not fall on the floor I can hold a sober conversation with a person who doesn't even know I'm into psycho-actives

Either way, two years ago I couldn't have done that. It's the same with LSD, I can handle things in extremely strong trips that I once found nearly impossible in mild trips.
So yeah I can't answer your question; only you can

Are you good at acting sober on other drugs? To who do you need to appear sober? If you say 'I had a few beers' if they notice anything, would it be a valid excuse? If you're unsure and inexperienced, try it a few times in a setting where you can just be yourself freely and do anything you want (within the usual limits ofcourse).