+0
“Come join us for
a dual celebration”

You are cordially invited to join us for Aartis’s wedding celebration and also for the launch of the new events company, Momentum. Grace the occasion by being a part of the beginning of the new beginnings

or

You are cordially invited for Aarti’s pre-wedding bash and also an occasion for the launch of the new events company, MOMENTUM. She seeks your blessings for embarking this new journey.
+0
.
It depends entirely on how formal or informal you wish to be... but you have mixed these registers in both cases. Only suggestions:

FORMAL:
You are cordially invited to a pre-wedding celebration of Aartis [and ?] and the inauguration of the new events company, MOMENTUM. Please join us for these new beginnings.

INFORMAL
You are invited to Aarti’s pre-wedding bash and the launch of the new events company, MOMENTUM. Come fly with us!