It's fairly correct. The only things I would change is to add some commas and maybe change "we" from the 2nd sentence into "we'll" or "we will". Also, I would try switching out some of the vocabulary or adjectives for more bold ones.
I would write it like this:
Grand events are arriving but, we don't want to reveal too much either. For the moment, we will give you a taste of some of the gadgets made for the upcoming events.